Re: [Hampshire] grep -50 foo /dev/sda1 runs out of memory
Just thought I should close this off. Turned out there was a file left over from the edit session, buried in my .mozilla/whatever directory. Must have missed it when doing the 'find' command due to all the /proc and /dev entries. Didn't get anyy result with Hugo's 'tr' approach, though I may have mistyped something. But Bob Dunlop's 'strings' technique came up trumps. So, many thanks! -- best regards, Victor Churchill, Bournemouth -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] grep -50 foo /dev/sda1 runs out of memory
On Thu, Feb 10 at 10:22, Victor Churchill wrote: ... I believe 'grep -number' will give number lines of context around the match. Like 'grep -A 100 -B 100. grep -number is not portable -A -B is. Unless you are putting it in a script whatever works for you is fine. Anyway rather than the tr above you might want to try out strings. strings /dev/sda1 | grep -100 Vishal Strings is a filter specifically designed to find printable strings in a file so presumably designed to cope with lots of binary mush. Let's hope your tempfiles weren't stored on ramdisk. -- Bob Dunlop -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
[Hampshire] grep -50 foo /dev/sda1 runs out of memory
Hi, I have a firm recollection of reading war stories in the past about how the above incantation will find textual information on the disk that you have mislaid (the information, that is, not the disk). So I had exited an editor session attached to my GMail through the It's All Text! Firefox extension, which lets you fill in textareas in an external editor. Except in this case it didn't - I typed stuff in for about 20 minutes, saved, exited and the work was /not/ in my mail window. Bother, said Pooh. So I recalled this grep trick.Unfortunately it chugs for a while then exits with an error: victor@pan2:~$ sudo grep -100 Vishal /dev/sda1 grep: /dev/sda1: Cannot allocate memory I /thought/ grep would work through a file of any size... is ther anything I can do about this? thanks, victor -- best regards, Victor Churchill, Bournemouth -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] grep -50 foo /dev/sda1 runs out of memory
On Thu, Feb 10, 2011 at 07:20:41PM +, Victor Churchill wrote: So I recalled this grep trick.Unfortunately it chugs for a while then exits with an error: victor@pan2:~$ sudo grep -100 Vishal /dev/sda1 grep: /dev/sda1: Cannot allocate memory I /thought/ grep would work through a file of any size... is ther anything I can do about this? Possibly it's because the disk has large expanses of data with no LF characters in it. It's most likely to be zeroes or control characters, so I'd suggest something like: sudo tr -d \\000-\\011\\013-\\037 /dev/sda1 | grep -100 Vishal It's not guaranteed to work, but you might get lucky. :) If you actually saved it, have you tried looking for that text in extant files, rather than grepping the whole disk? Also, note that you're only going to get one line of the output with little or no indication of where in the disk it is, so you _still_ won't have the data -- just one line of it and no idea of where the rest is, so the above incantation probably isn't what you need. (I'm too tired right now to think of what it is that you _do_ need, though; sorry. Maybe someone else can help with that). Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Summoning his Cosmic Powers, and glowing slightly --- from his toes... signature.asc Description: Digital signature -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
