Commands by mnikhil

Commands by mnikhil (27)

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find largest file in /var

find largest file in /var
This is sample output - yours may be different.
4

find /var -mount -ls -xdev | /usr/bin/sort -nr +6 | more

mnikhil · 2009-05-16 10:53:55 2
Creating a ZFS Storage Pool by Using Files

This command creates an unmirrored pool using files. While not recommended, a pool based on files can be useful for experimental purposes.
This is sample output - yours may be different.
-2

zpool create tank /path/to/file/a /path/to/file/b

mnikhil · 2009-05-16 10:46:17 0
Creating a Mirrored Storage Pool using Zpool

command creates a pool with two mirrors, where each mirror contains two disks.
This is sample output - yours may be different.
-2

zpool create tank mirror c0t0d0 c0t1d0 mirror c0t2d0 c0t3d0

mnikhil · 2009-05-16 10:44:56 0
Creating a RAID-Z Storage Pool

The following command creates a pool with a single raidz root vdev that consists of six disks.
This is sample output - yours may be different.
-2

zpool create tank raidz c0t0d0 c0t1d0 c0t2d0 c0t3d0 c0t4d0 c0t5d0

mnikhil · 2009-05-16 10:44:05 0
Copy data using gtar

It copies the entire current working directory to the destination directory with compression enabled.
This is sample output - yours may be different.
1

gtar cpf - . | (cd /dest/directory; gtar xpf -)

mnikhil · 2009-05-15 13:23:00 1
color grep with specification of colors with GREP_COLOR env variable
This is sample output - yours may be different.
-2

setenv GREP_COLOR '1;37;41'

mnikhil · 2009-02-07 18:56:23 0
reset the bizzarre gone junk terminal to normal
This is sample output - yours may be different.
-2

echo "Xc" | tr "Xo" "\033\017

mnikhil · 2009-02-07 18:55:27 1
Use color grep by default

Alias the grep command to show colored results by default.
This is sample output - yours may be different.
1

alias grep 'gnu grep -i --color=auto'

mnikhil · 2009-02-07 18:54:56 0
show all programs connected or listening on a network port

Use the aliased command 'nsl'
This is sample output - yours may be different.
3

alias nsl 'netstat -f inet | grep -v CLOSE_WAIT | cut -c-6,21-94 | tail +2'

mnikhil · 2009-02-07 18:54:12 1
finding cr-lf files aka dos files with ^M characters

its useful to run dos2unix command later on them.
This is sample output - yours may be different.
1

find $(pwd) -type f -exec grep -l "$(echo "\r")" {} \;

mnikhil · 2009-02-07 18:53:00 2
copying data with cpio

Copy data to the destination using commands such as cpio (recommended), tar, rsync, ufsdump, or ufsrestore. Example: Let the source directory be /source, and let the destination directory be /destination. # cd /source # cd .. # find ./source -depth -print | cpio -cvo> /destination/source_data.cpio # cd /destination # cpio -icvmdI ./source_data.cpio # rm -rf ./source_data.cpio
This is sample output - yours may be different.
0

find ./source -depth -print | cpio -cvo> /destination/source_data.cpio; cd /destination; cpio -icvmdI ./source_data.cpio; rm -rf ./source_data.cpio

mnikhil · 2009-02-07 18:51:49 0
finding more large files
This is sample output - yours may be different.
2

find / -xdev -size +1024 -exec ls -al {} \; | sort -r -k 5

mnikhil · 2009-02-07 18:50:44 1
list files by testing the ownership
This is sample output - yours may be different.
0

ls -la | awk '$3 == "oracle" || $3 == "root" {print $9}'

mnikhil · 2009-02-07 18:50:17 0
file sizes of current directory
This is sample output - yours may be different.
0

ls -la | awk '{print $5, " " ,$9}' | sort -rn

mnikhil · 2009-02-07 18:49:56 2
cloning partition tables under Solaris
This is sample output - yours may be different.
1

prtvtoc /dev/rdsk/c0t0d0s2 | fmthard -s - /dev/rdsk/c0t1d0s2

mnikhil · 2009-02-07 18:49:20 0
move files without actually touching them
This is sample output - yours may be different.
0

cd /some/directory \&\& tar cf - | cd /some/directory \&\& tar xvf - */

mnikhil · 2009-02-07 18:48:39 0
Using psnup to get two pages per page
This is sample output - yours may be different.
0

psnup -2 file.ps | lpr

mnikhil · 2009-02-07 18:48:18 0
printing with psnup
This is sample output - yours may be different.
0

psnup -4 -pa4 -Pa4 file.ps file2.ps

mnikhil · 2009-02-07 18:47:53 0
To generate the list of dates using bash shell
This is sample output - yours may be different.
-1

now=`date +"%Y/%m/%d" -d "04/02/2005"` ; end=`date +"%Y/%m/%d" -d "07/31/2005"`; while [ "$now" != "$end" ] ; do now=`date +"%Y/%m/%d" -d "$now + 1 day"`; echo "$now"; done

mnikhil · 2009-02-07 18:46:49 2
example usage of sar
This is sample output - yours may be different.
-3

sar -g 5 5

mnikhil · 2009-02-07 18:45:22 0
Renaming jpg extension files at bunch
This is sample output - yours may be different.
-1

find . -name "*.jpg" | perl -ne'chomp; $name = $_; $quote = chr(39); s/[$quote\\!]/_/ ; print "mv \"$name\" \"$_\"\n"'

mnikhil · 2009-02-07 18:44:54 1
to get how many users logged in and logged out and how many times purely using awk
This is sample output - yours may be different.
0

last | awk '$1!~/wtmp/{logs[$1]++}END{for (i in logs) print i, logs[i]}'

mnikhil · 2009-02-07 18:43:33 0
To get how many users logged in and logged out and how many times ?
This is sample output - yours may be different.
1

last | awk '{ print $1 }' | sort | uniq -c | grep -v wtmp

mnikhil · 2009-02-07 18:42:59 1
To get the different name field nformation on rpm packages
This is sample output - yours may be different.
0

rpm -qa --qf '%{name}'

mnikhil · 2009-02-07 18:42:32 0
To get the latest information on rpm packages
This is sample output - yours may be different.
0

rpm -qa --last

mnikhil · 2009-02-07 18:41:52 0
1 2 >

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prevent large files from being cached in memory (backups!)

We all know... $ nice -n19 for low CPU priority. $ ionice -c3 for low I/O priority. nocache can be useful in related scenarios, when we operate on very large files just a single time, e.g. a backup job. It advises the kernel that no caching is required for the involved files, so our current file cache is not erased, potentially decreasing performance on other, more typical file I/O, e.g. on a desktop. http://askubuntu.com/questions/122857 https://github.com/Feh/nocache http://packages.debian.org/search?keywords=nocache http://packages.ubuntu.com/search?keywords=nocache To undo caching of a single file in hindsight, you can do $ cachedel To check the cache status of a file, do $ cachestats

(Git) Revert files with changed mode, not content

I sometimes (due to mismanagement!) end up with files in a git repo which have had their modes changed, but not their content. This one-liner lets me revert the mode changes, while leaving changed-content files be, so I can commit just the actual changes made.

Get your outgoing IP address

Find the package that installed a command

Extract title from HTML files

This command can be used to extract the title defined in HTML pages

Renames all files in the current directory such that the new file contains no space characters.

This is a better version, as it does no command piping, uses for instead of while loops, which allows for a list of files in the current working directory to be natively processed. It also uses the -v/verbose option with mv to let you know what the command is doing. While the command does exactly the same in a better way, I would modify the sed option to replace spaces with underscores instead, or dashes. Please note that you'll receive errors with this command as it tries to rename files that don't even have spaces. This is an alternative to: http://www.commandlinefu.com/commands/view/8761/renames-all-files-in-the-current-directory-such-that-the-new-file-contains-no-space-characters.

Extract a IRC like chat log out of an Adium xml logfile

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

split a file by a specific number of lines

Splits the file "my_file" every 500 lines. Will create files called xx01 xx02 and so on. You can change the prefix by using the -f option. Comes in handy for splitting logfiles for example. I am using it for feeding a logfile parser with smaller files instead of one big file (due to performance reasons)

Sort a character string

Sorts a character string, using common shell commands.

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