Commands by mnikhil

Commands by mnikhil (27)

sorted by

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 6
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 6
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 15
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 4
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 8
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 11
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 10
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 10
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 11
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 16
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 19
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 11
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 11
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 14
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 11
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 10
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 11
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 11
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 13
example usage of sar
This is sample output - yours may be different.
-3

sar -g 5 5

mnikhil · 2009-02-07 18:45:22 12
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 12
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 11
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 12
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 11
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 11
1 2 >

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

reapair all mySQL/mariaDB databases

while dumping database if you see following error/warning than you have to repair broken tables/rows

Create a progress bar over entire window until we count to 1000

https://wuseman.nr1.nu:8080/file/E8AcLVgMPZ2LSJQf/9BD8V8ADYNhR6cca/parallel_print_progress.gif

Replace "space" char with "dot" char in current directory file names

list files recursively by size

Recursive find and replace file extension / suffix (mass rename files)

Find recursively all files in ~/Notes with the extension '.md' and pipe that via xargs to rename command, which will replace every '.md' to '.txt' in this example (existing files will not be overwritten).

Get playlist for Livestream on YouTube

list files recursively by size

delete duplicate lines from a file and keep the order of the other lines

i wanted to delete all duplicate lines from .bash_history and keep the order of the other lines. the command cat's the file and adds line numbers, then sorts by the second column. afterwards uniq omits repeated lines, but skips the first field (the line number). then it sorts by the line numbers and at the end cuts the numbers off.

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

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"

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands by mnikhil