Re: OT: unix newbie questions
Le Mardi 06 Juin 2006 08:36, Fredrik Lundh a écrit :
> > *26. You observed that some of your group members are fiddling with your
> > file "myfile" and you wanted to remove the read permission to your
> > group. How do you do? (1)
>
> >>> os.chmod("myfile.txt", 0404)
rather,
>>> os.chmod("myfile.txt", 0400)
I guess.
or maybe you want something like this :
import os, stat
os.chmod("myfile.txt", os.stat("myfile.txt").st_mode - stat.S_IRGRP)
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Re: OT: unix newbie questions
Fredrik Lundh wrote:
>> *24. Display recent 10 java files, (with *.java extension) , in
>> descending order by time, latest to oldest time. (1) *
>
> >>> files = sorted(glob.glob("*.py"), key=os.path.getmtime)[-10:]
> >>> files.reverse()
(to display the files, use print)
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Re: OT: unix newbie questions
Carlos Lopez wrote:
> Please help i am losing my mind ... UNIX Newbee
>
> *23. How do you add a line to the end of an existing file "myfile" with
> date stamp. (1) *
>>> f = open("myfile", "a+")
>>> f.write(datestamp)
>>> f.close()
> *24. Display recent 10 java files, (with *.java extension) , in
> descending order by time, latest to oldest time. (1) *
>>> files = sorted(glob.glob("*.py"), key=os.path.getmtime)[-10:]
>>> files.reverse()
> *25. How do you set only read permissions to user, group and others in
> octal mode for a file "myfile.txt" ? (2)
>>> os.chmod("myfile.txt", 0444) # note the leading zero
> *26. You observed that some of your group members are fiddling with your
> file "myfile" and you wanted to remove the read permission to your
> group. How do you do? (1)
>>> os.chmod("myfile.txt", 0404)
> *28. Here is another long listing of a file. (1)*
> -rw-r- 1 Y435678 odms 20 Sep 02 17:03 file.txt. ***
>
> *What are the owner permissions? *
>>> s = os.stat("urllib.py").st_mode
>>> if s & stat.S_IREAD: print "READ"
>>> if s & stat.S_IWRITE: print "WRITE"
>>> if s & stat.S_IEXEC: print "EXEC"
> *29. The file “users_data” has the following contents : (1)
> Tom Smith 7.00 15 105.00
> Rob Sheryl 8.00 20 160.00
> Ken Bradman 7.00 13 91.00
> Peter Smith 6.00 15 90.00
> Dennis Smith 8.00 13 104.00
> Tom Dave9.00 12 108.00 *
>
> *How do you sort the above file and redirect the output to another file
> called “sortedusers” *
>>> out = open("sortedusers", "w")
>>> out.writelines(sorted(open("users_data")))
> *20. What is the command to list files in a directory : (2)
>>> os.listdir(directory)
or, if you want full path names and glob-style filtering:
>>> glob.glob(os.path.join(directory, "*"))
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Re: OT: unix newbie questions
Another option is zsh, which is very much like bash, but better ;) -- http://mail.python.org/mailman/listinfo/python-list
Re: OT: unix newbie questions
In article <[EMAIL PROTECTED]>, "Gerard Flanagan" <[EMAIL PROTECTED]> wrote: >* To create an empty __init__.py file I do 'vim __init__.py' then >immediately exit vim, is there a shell or vim command which will create >an empty file without opening the editor? man touch >* If I want to do : > >mv mypackage-1.0.2.tar.gz subdir/mypackage-1.0.2.tar.gz > > then tab-completion gives me the first occurrence of the file, but I >have to type the second occurrence - is there a way of not having to >type it? This is not how bash works. bash lists all the possible completions. >* cd ~ brings me to my home directory, is there a means by which I can >set up a similar alias for, say, /usr/local/www, so I can do: eg. cd ^ >to get to that directory? You could set up a variable, e.g. in bash export w=/usr/local/www then cd $w >* I'm using the tcsh shell and have no problems with it, but bash seems >more popular - any reason to change? (I don't intend writing many shell >scripts) Last time I used tcsh, its autocorrection facility kept making wrong suggestions. I just don't think it's worth using any more. Stick to bash for all your shell needs, both interactive and scripting, and leave it at that. >* Any other unix/vim tips for a 'nix newb?! Try emacs. -- http://mail.python.org/mailman/listinfo/python-list
Re: OT: unix newbie questions
On Sat, Mar 25, 2006 at 03:45:56AM -0800, Gerard Flanagan wrote: [...] > * If I want to do : > > mv mypackage-1.0.2.tar.gz subdir/mypackage-1.0.2.tar.gz > > then tab-completion gives me the first occurrence of the file, but I > have to type the second occurrence - is there a way of not having to > type it? In this specific case you don't need second filename. mv mypackage-1.0.2.tar.gz subdir/ is enough. If you need filename for some reason, use this. mv mypackage-1.0.2.tar.gz subdir/mypackage-1.0.2.tar.gz.backup => mv mypackage-1.0.2.tar.gz subdir/!#:1.backup This works for both bash and (t)csh. --Inyeol -- http://mail.python.org/mailman/listinfo/python-list
Re: OT: unix newbie questions
> * I'm using the tcsh shell and have no problems with it, but bash seems > more popular - any reason to change? (I don't intend writing many shell > scripts) You can do this in bash: $ python myprog > stdout.txt 2> stderr.txt and have output to sys.stdout and sys.stderr go in separate files. Quite handy for separating output and debugging comments. I believe that this is impossible in tcsh (where you only can do $ python myprog &> stdout_and_stderr.txt to catch stdout and stderr at the same time). Also: bash_completions. It keeps track of arguments and options for commonly used programs and commands. If you type "cd " and hit tab for completions you will only see directories, since bash_completions knows that this is all cd accepts. Don't know if tcsh has anything similar. Cheers, Joel Hedlund -- http://mail.python.org/mailman/listinfo/python-list
Re: OT: unix newbie questions
> * If I want to do : > > mv mypackage-1.0.2.tar.gz subdir/mypackage-1.0.2.tar.gz > > then tab-completion gives me the first occurrence of the file, but I > have to type the second occurrence - is there a way of not having to > type it? No need to give it the name the second time. # touch foo # mkdir d # mv foo d # ls d foo # Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: OT: unix newbie questions
Gerard Flanagan: >* To create an empty __init__.py file I do 'vim __init__.py' then >immediately exit vim, is there a shell or vim command which will create >an empty file without opening the editor? touch __init__.py >* cd ~ brings me to my home directory, is there a means by which I can >set up a similar alias for, say, /usr/local/www, so I can do: eg. cd ^ >to get to that directory? You could create an alias in your shell. -- René Pijlman Wat wil jij leren? http://www.leren.nl -- http://mail.python.org/mailman/listinfo/python-list
