RE: arg list too long in unix
Hi all,
Is there something like,
unix is unable to use commands like ls -ltr (sort etc)
when there are huge number of files in a directory(may
be thousands/millions).
If yes, what is the limit and how to know it on sun
solaris 2.8.
thnx and regards,
srinivas
--- Lakhani, Vipul [EMAIL PROTECTED] wrote:
maybe use find (check the syntax of below)
(just guessing)
eg find . -name '*' -exec rm {} \;
readt this :
http://www.linuxjournal.com/article.php?sid=6060
-Original Message-
From: kommareddy sreenivasa
[mailto:[EMAIL PROTECTED]]
Sent: 29 August 2002 11:59
To: Multiple recipients of list ORACLE-L
Subject: arg list too long in unix
Hi all,
OS: SOlaris 2.8
DB: 8i
In the clean up process of the following files, I am
trying to list out the files that start with cz.
cz-session-returnui177_11Jan02_0959AM_33509.txt
cz-session-Applet178_11Jan02_0959AM_34108.txt
cz-session-returnui175_11Jan02_0959AM_20504.txt
cz-session-DHTML176_11Jan02_0959AM_22335.txt
cz-session-returnui179_11Jan02_1000AM_34566.txt
cz-session-Applet180_11Jan02_1000AM_34818.txt
cz-session-BatchSingle181_11Jan02_1001AM_07757.txt
cz-session-BatchSingle182_11Jan02_1001AM_11687.txt
cz-session-BatchSingle183_11Jan02_1001AM_14010.txt
cz-session-BatchSingle184_11Jan02_1001AM_17708.txt
cz-session-BatchSingle185_11Jan02_1001AM_20029.txt
but when I issue ls -ltr cz* , I am getting arg list
too long error. I 70,000-80,000 files that needs to
be
removed from the directory.
I cant list them using ls -ltr *session* as this
string may change. I have to identify the files that
srart with cz only.
can somebody through somelight on this.
thanx in advance,
srinivas
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RE: arg list too long in unix
-- kommareddy sreenivasa [EMAIL PROTECTED] Hi all, Is there something like, unix is unable to use commands like ls -ltr (sort etc) when there are huge number of files in a directory(may be thousands/millions). If yes, what is the limit and how to know it on sun solaris 2.8. This is not an issue with the command, but the buffer used by the O/S to store the comman line arguments. Standard sizes are 4KB or 8KB (i.e., on page). If the command line arg's exceed this size then the command cannot be started. Classic case is a directory with too many files in it; ls may work fine but ls * will blow up because the shell's expanding * overflows the buffer. If the file names are 500 char's long then you may have problems with only 10 files in the directory [don't laugh, I've seen it]. ls is partcularly bad about dealing with over-populated dir's becuse it sorts the result, which can be expensive in a 10 000 file diredtory; find does not sort anything and is better suited to dealing with huge file lists. -- Steven Lembark 2930 W. Palmer Workhorse Computing Chicago, IL 60647 +1 800 762 1582 -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Steven Lembark INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: arg list too long in unix
The size of the buffer used to store parameters is actually configurable in most Unix versions I've had a look at. Somewhere around 4K, from memory. Would be very surprised if it wasn't configurable in Solaris. Would also be very surprised if you find one techo at Sun that knows how to change it. It's actually one of the configurable kernel parameters, but you got to edit it directly. Last time I did this was 6 years ago, so don't even dream of asking me to remember the details. I've got enough trouble trying to remember what I had for breakfast today! Dig into the man pages, have a look at xargs command and follow the links from there. That's how I came across this. info(2) is also useful. Cheers Nuno Souto [EMAIL PROTECTED] - Original Message - If yes, what is the limit and how to know it on sun solaris 2.8. -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Nuno Souto INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: arg list too long in unix
Use the xargs command. Read about it in the man pages. Or use find, but that is more complex. Cheers Nuno Souto [EMAIL PROTECTED] - Original Message - OS: SOlaris 2.8 DB: 8i In the clean up process of the following files, I am trying to list out the files that start with cz. cz-session-returnui177_11Jan02_0959AM_33509.txt cz-session-Applet178_11Jan02_0959AM_34108.txt cz-session-returnui175_11Jan02_0959AM_20504.txt cz-session-DHTML176_11Jan02_0959AM_22335.txt cz-session-returnui179_11Jan02_1000AM_34566.txt cz-session-Applet180_11Jan02_1000AM_34818.txt cz-session-BatchSingle181_11Jan02_1001AM_07757.txt cz-session-BatchSingle182_11Jan02_1001AM_11687.txt cz-session-BatchSingle183_11Jan02_1001AM_14010.txt cz-session-BatchSingle184_11Jan02_1001AM_17708.txt cz-session-BatchSingle185_11Jan02_1001AM_20029.txt but when I issue ls -ltr cz* , I am getting arg list too long error. I 70,000-80,000 files that needs to be removed from the directory. I cant list them using ls -ltr *session* as this string may change. I have to identify the files that srart with cz only. can somebody through somelight on this. -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Nuno Souto INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: arg list too long in unix
kommareddy sreenivasa wrote: Hi all, OS: SOlaris 2.8 DB: 8i In the clean up process of the following files, I am trying to list out the files that start with cz. cz-session-returnui177_11Jan02_0959AM_33509.txt cz-session-Applet178_11Jan02_0959AM_34108.txt cz-session-returnui175_11Jan02_0959AM_20504.txt cz-session-DHTML176_11Jan02_0959AM_22335.txt cz-session-returnui179_11Jan02_1000AM_34566.txt cz-session-Applet180_11Jan02_1000AM_34818.txt cz-session-BatchSingle181_11Jan02_1001AM_07757.txt cz-session-BatchSingle182_11Jan02_1001AM_11687.txt cz-session-BatchSingle183_11Jan02_1001AM_14010.txt cz-session-BatchSingle184_11Jan02_1001AM_17708.txt cz-session-BatchSingle185_11Jan02_1001AM_20029.txt but when I issue ls -ltr cz* , I am getting arg list too long error. I 70,000-80,000 files that needs to be removed from the directory. I cant list them using ls -ltr *session* as this string may change. I have to identify the files that srart with cz only. can somebody through somelight on this. thanx in advance, srinivas Srinivas, If you are using the Bourne shell try issuing the same command under ksh. HTH Stephane Faroult Oriole Software -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Stephane Faroult INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: arg list too long in unix
how about; $ find . -name 'cz*' -print | xargs ls -lt or $ find . -name 'cz*' -print | xargs rm -Original Message- From: kommareddy sreenivasa [mailto:[EMAIL PROTECTED]] Sent: Thursday, August 29, 2002 6:59 AM To: Multiple recipients of list ORACLE-L Subject: arg list too long in unix Hi all, OS: SOlaris 2.8 DB: 8i In the clean up process of the following files, I am trying to list out the files that start with cz. cz-session-returnui177_11Jan02_0959AM_33509.txt cz-session-Applet178_11Jan02_0959AM_34108.txt cz-session-returnui175_11Jan02_0959AM_20504.txt cz-session-DHTML176_11Jan02_0959AM_22335.txt cz-session-returnui179_11Jan02_1000AM_34566.txt cz-session-Applet180_11Jan02_1000AM_34818.txt cz-session-BatchSingle181_11Jan02_1001AM_07757.txt cz-session-BatchSingle182_11Jan02_1001AM_11687.txt cz-session-BatchSingle183_11Jan02_1001AM_14010.txt cz-session-BatchSingle184_11Jan02_1001AM_17708.txt cz-session-BatchSingle185_11Jan02_1001AM_20029.txt but when I issue ls -ltr cz* , I am getting arg list too long error. I 70,000-80,000 files that needs to be removed from the directory. I cant list them using ls -ltr *session* as this string may change. I have to identify the files that srart with cz only. can somebody through somelight on this. thanx in advance, srinivas __ Do You Yahoo!? Yahoo! Finance - Get real-time stock quotes http://finance.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: kommareddy sreenivasa INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Glenn Travis INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: arg list too long in unix
I'm not sure xargs will work -- it seems to me that since xargs is
typically invoked as: 'ls cz* | xargs rm', Nuno is likely to get the same
arg list too long error. I think the best way to delete the files would
be: 'find . -name cz\* -exec rm -f {} \;'
-- Philip
- Original Message -
To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED]
Sent: Thursday, August 29, 2002 7:43 AM
Use the xargs command.
Read about it in the man pages.
Or use find, but that is more complex.
Cheers
Nuno Souto
[EMAIL PROTECTED]
- Original Message -
OS: SOlaris 2.8
DB: 8i
In the clean up process of the following files, I am
trying to list out the files that start with cz.
cz-session-returnui177_11Jan02_0959AM_33509.txt
cz-session-Applet178_11Jan02_0959AM_34108.txt
cz-session-returnui175_11Jan02_0959AM_20504.txt
cz-session-DHTML176_11Jan02_0959AM_22335.txt
cz-session-returnui179_11Jan02_1000AM_34566.txt
cz-session-Applet180_11Jan02_1000AM_34818.txt
cz-session-BatchSingle181_11Jan02_1001AM_07757.txt
cz-session-BatchSingle182_11Jan02_1001AM_11687.txt
cz-session-BatchSingle183_11Jan02_1001AM_14010.txt
cz-session-BatchSingle184_11Jan02_1001AM_17708.txt
cz-session-BatchSingle185_11Jan02_1001AM_20029.txt
but when I issue ls -ltr cz* , I am getting arg list
too long error. I 70,000-80,000 files that needs to be
removed from the directory.
I cant list them using ls -ltr *session* as this
string may change. I have to identify the files that
srart with cz only.
can somebody through somelight on this.
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Nuno Souto
INET: [EMAIL PROTECTED]
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Author: Philip Douglass
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RE: arg list too long in unix
Title: RE: arg list too long in unix
go into the top dir and run
find . -name cz-session-* | xargs rm -f
or
find . -name cz-session-* -exec rm -f {} \;
the first runs faster but keep in mind that
in other scenarios xargs splits stdin into
file names on space and newline.
-Original Message-
From: Nuno Souto [mailto:[EMAIL PROTECTED]]
Sent: Thursday, August 29, 2002 7:43 AM
To: Multiple recipients of list ORACLE-L
Subject: Re: arg list too long in unix
Use the xargs command.
Read about it in the man pages.
Or use find, but that is more complex.
Cheers
Nuno Souto
[EMAIL PROTECTED]
- Original Message -
OS: SOlaris 2.8
DB: 8i
In the clean up process of the following files, I am
trying to list out the files that start with cz.
cz-session-returnui177_11Jan02_0959AM_33509.txt
cz-session-Applet178_11Jan02_0959AM_34108.txt
cz-session-returnui175_11Jan02_0959AM_20504.txt
cz-session-DHTML176_11Jan02_0959AM_22335.txt
cz-session-returnui179_11Jan02_1000AM_34566.txt
cz-session-Applet180_11Jan02_1000AM_34818.txt
cz-session-BatchSingle181_11Jan02_1001AM_07757.txt
cz-session-BatchSingle182_11Jan02_1001AM_11687.txt
cz-session-BatchSingle183_11Jan02_1001AM_14010.txt
cz-session-BatchSingle184_11Jan02_1001AM_17708.txt
cz-session-BatchSingle185_11Jan02_1001AM_20029.txt
but when I issue ls -ltr cz* , I am getting arg list
too long error. I 70,000-80,000 files that needs to be
removed from the directory.
I cant list them using ls -ltr *session* as this
string may change. I have to identify the files that
srart with cz only.
can somebody through somelight on this.
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Nuno Souto
INET: [EMAIL PROTECTED]
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
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also send the HELP command for other information (like subscribing).
Re: arg list too long in unix
I cant list them using ls -ltr *session* as this string may change. I have to identify the files that srart with cz only. can somebody through somelight on this. man xargs; -- Steven Lembark 2930 W. Palmer Workhorse Computing Chicago, IL 60647 +1 800 762 1582 -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Steven Lembark INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: arg list too long in unix
-- Philip Douglass [EMAIL PROTECTED]
I'm not sure xargs will work -- it seems to me that since xargs is
typically invoked as: 'ls cz* | xargs rm', Nuno is likely to get the same
arg list too long error. I think the best way to delete the files would
be: 'find . -name cz\* -exec rm -f {} \;'
Anyone who invokes xargs from ls * needs to learn how to use
xargs: feed it with things that ae not affected by the arg
list. For example:
find . -type f -name 'cz*' | xargs rm -f;
is one nice way: the '*' is not expanded on the command line
but used with an internal glob call in find.
Other problem with using ls for large file op's is that it
attempts to sort the output, which is expensive and a memory
hog. Find simply spits out matching files as they are found.
--
Steven Lembark 2930 W. Palmer
Workhorse Computing Chicago, IL 60647
+1 800 762 1582
--
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Author: Steven Lembark
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RE: arg list too long in unix
-- Markham, Richard [EMAIL PROTECTED] find . -name cz-session-* | xargs rm -f This will handle files in 8K chunks; find .. -e will fork for each file. Net result is that xargs is a much better way to go. On a multi-cpu system you can also use xargs -P to run jobs in parallel (at the expense of more forks). Aside: be quite sure to run this on local storage only; running this on networked storage can saturate the network during the erase cycle. -- Steven Lembark 2930 W. Palmer Workhorse Computing Chicago, IL 60647 +1 800 762 1582 -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Steven Lembark INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: arg list too long in unix
Quite true, but ironically enough, the xargs manpage (on my system as well
as many others) only has examples using ls to feed xargs. I meant to end
the exec param with \+ instead of \; which aggregates a set to operate on.
I'm not clear on whether that means one giant set, or several smaller
sets, so I suppose it could have the same 'arg list too long' error as ls.
I've never had to worry about this issue since I've never had 70,000 files
in one directory before!
-- Philip
- Original Message -
To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED]
Sent: Thursday, August 29, 2002 12:23 PM
-- Philip Douglass [EMAIL PROTECTED]
I'm not sure xargs will work -- it seems to me that since xargs is
typically invoked as: 'ls cz* | xargs rm', Nuno is likely to get the
same
arg list too long error. I think the best way to delete the files would
be: 'find . -name cz\* -exec rm -f {} \;'
Anyone who invokes xargs from ls * needs to learn how to use
xargs: feed it with things that ae not affected by the arg
list. For example:
find . -type f -name 'cz*' | xargs rm -f;
is one nice way: the '*' is not expanded on the command line
but used with an internal glob call in find.
Other problem with using ls for large file op's is that it
attempts to sort the output, which is expensive and a memory
hog. Find simply spits out matching files as they are found.
--
Steven Lembark 2930 W. Palmer
Workhorse Computing Chicago, IL 60647
+1 800 762 1582
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Steven Lembark
INET: [EMAIL PROTECTED]
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Author: Philip Douglass
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Re: arg list too long in unix
Might take awhile to fork 70k+ shells.
I don't know of any good reason to ever use -exec.
If the arg list is too long, one way to shorten it is with 'head'.
find /dir_2_clean -name cz* -print | head -1000 | xargs rm -f
Just run that til the files are all gone.
Jared
On Thursday 29 August 2002 07:58, Philip Douglass wrote:
I'm not sure xargs will work -- it seems to me that since xargs is
typically invoked as: 'ls cz* | xargs rm', Nuno is likely to get the same
arg list too long error. I think the best way to delete the files would
be: 'find . -name cz\* -exec rm -f {} \;'
-- Philip
- Original Message -
To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED]
Sent: Thursday, August 29, 2002 7:43 AM
Use the xargs command.
Read about it in the man pages.
Or use find, but that is more complex.
Cheers
Nuno Souto
[EMAIL PROTECTED]
- Original Message -
OS: SOlaris 2.8
DB: 8i
In the clean up process of the following files, I am
trying to list out the files that start with cz.
cz-session-returnui177_11Jan02_0959AM_33509.txt
cz-session-Applet178_11Jan02_0959AM_34108.txt
cz-session-returnui175_11Jan02_0959AM_20504.txt
cz-session-DHTML176_11Jan02_0959AM_22335.txt
cz-session-returnui179_11Jan02_1000AM_34566.txt
cz-session-Applet180_11Jan02_1000AM_34818.txt
cz-session-BatchSingle181_11Jan02_1001AM_07757.txt
cz-session-BatchSingle182_11Jan02_1001AM_11687.txt
cz-session-BatchSingle183_11Jan02_1001AM_14010.txt
cz-session-BatchSingle184_11Jan02_1001AM_17708.txt
cz-session-BatchSingle185_11Jan02_1001AM_20029.txt
but when I issue ls -ltr cz* , I am getting arg list
too long error. I 70,000-80,000 files that needs to be
removed from the directory.
I cant list them using ls -ltr *session* as this
string may change. I have to identify the files that
srart with cz only.
can somebody through somelight on this.
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Nuno Souto
INET: [EMAIL PROTECTED]
Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051
San Diego, California-- Public Internet access / Mailing Lists
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
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Author: Jared Still
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Re: arg list too long in unix
If the arg list is too long, one way to shorten it is with 'head'. find /dir_2_clean -name cz* -print | head -1000 | xargs rm -f The whole point of xargs is that it doesn't get overlong arguments -- unless one of the file paths is 4KB by itself. This leaves the head extraneous: cd $someplace; find . -type f -name 'cz*' | xargs rm -f; will happily do the deed. Advantage to cd is that a naked '.' won't blow off the entire system via something like '/ dir_2_clean'. -- Steven Lembark 2930 W. Palmer Workhorse Computing Chicago, IL 60647 +1 800 762 1582 -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: arg list too long in unix
ls -1 cz* /tmp/1.1
vi /tmp/1.1
:1,$ s/^/rm -f /
ZZ
/tmp/1.1
joe
Philip Douglass wrote:
I'm not sure xargs will work -- it seems to me that since xargs is
typically invoked as: 'ls cz* | xargs rm', Nuno is likely to get the same
arg list too long error. I think the best way to delete the files would
be: 'find . -name cz\* -exec rm -f {} \;'
-- Philip
- Original Message -
To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED]
Sent: Thursday, August 29, 2002 7:43 AM
Use the xargs command.
Read about it in the man pages.
Or use find, but that is more complex.
Cheers
Nuno Souto
[EMAIL PROTECTED]
- Original Message -
OS: SOlaris 2.8
DB: 8i
In the clean up process of the following files, I am
trying to list out the files that start with cz.
cz-session-returnui177_11Jan02_0959AM_33509.txt
cz-session-Applet178_11Jan02_0959AM_34108.txt
cz-session-returnui175_11Jan02_0959AM_20504.txt
cz-session-DHTML176_11Jan02_0959AM_22335.txt
cz-session-returnui179_11Jan02_1000AM_34566.txt
cz-session-Applet180_11Jan02_1000AM_34818.txt
cz-session-BatchSingle181_11Jan02_1001AM_07757.txt
cz-session-BatchSingle182_11Jan02_1001AM_11687.txt
cz-session-BatchSingle183_11Jan02_1001AM_14010.txt
cz-session-BatchSingle184_11Jan02_1001AM_17708.txt
cz-session-BatchSingle185_11Jan02_1001AM_20029.txt
but when I issue ls -ltr cz* , I am getting arg list
too long error. I 70,000-80,000 files that needs to be
removed from the directory.
I cant list them using ls -ltr *session* as this
string may change. I have to identify the files that
srart with cz only.
can somebody through somelight on this.
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Author: Nuno Souto
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