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print the date of the unix epoch in a human readable form using perl.
This is sample output - yours may be different.
-1

perl -e 'print scalar localtime $ARGV[0],"\n" ' epoch

hypnojazz · 2009-03-25 18:40:21 10
Using gdiff only select lines that are common between two files

This commands will make it easier to select only common items between two files being compared. If your lines start with things other than lowercase a-z, adjust this Regex appropriately. Number of lines in the output has been set to no more than 10000, and should be adjusted as needed.
This is sample output - yours may be different.
-1

gdiff --unified=10000 input.file1 inpute.file2 | egrep -v "(^\+[a-z]|^\-[a-z])"| sort > outputfile.sorted

slashdot · 2009-06-18 20:35:00 8
burn an iso to cd or dvd
This is sample output - yours may be different.
-1

cdrecord -v path_to_iso_image.iso

eastwind · 2009-09-14 19:20:12 4
Command to find filesystem type

Show Sample Output
This is sample output - yours may be different.
```
/dev/sda7: Linux rev 1.0 ext4 filesystem data, UUID=5d91866d-17c4-4187-839e-0bf45619ca83 (needs journal recovery) (extents) (large files) (huge files)
```
-1

file -sL /dev/sda7

sandeepvreddy · 2012-12-20 07:38:20 4
Get summary of updateable packages on Debian/Ubuntu machines using salt stack
This is sample output - yours may be different.
-1

salt -G 'os_family:Debian' cmd.run ' /usr/lib/update-notifier/apt-check --human-readable'

hinnerk · 2013-06-22 22:55:04 9
Uncompress a directory full of tarred files (*.gz)

This is a little bash script that will take all files following the *gz pattern in the directory and apply the tar -zxvf command to them.
This is sample output - yours may be different.
-1

for i in *.tar.gz *.tgz; do tar -zxvf $i; done

bohemicus · 2009-02-18 10:58:12 8
List only the directories

No need for -l and the output can be sent directly into another function expecting directory names. Show Sample Output
This is sample output - yours may be different.
```
pub/
workspace/
```
-1

ls -F|grep /

romulusnr · 2009-10-08 16:35:15 4
bash script to zip a folder while ignoring git files and copying it to dropbox

Similar, but uses tarball instead of zip file
This is sample output - yours may be different.
-1

git archive HEAD | gzip > ~/Dropbox/archive.tar.gz

tamouse · 2011-06-08 09:44:07 3
random git-commit message

Put in your path (.bashrc or similar). Then instead of running '$ git-commit -m ' use '$ git-random'
This is sample output - yours may be different.
-1

git-random(){ gitRan=$(curl -L -s http://whatthecommit.com/ |grep -A 1 "\"c" |tail -1 |sed 's/<p>//'); git commit -m "$gitRan"; }

unixmonkey32483 · 2012-03-07 22:25:14 1006
Nice directory listings
This is sample output - yours may be different.
-1

alias ll="ls -lh --color=auto"

trivoallan · 2009-02-10 14:27:13 10
Check variable has been set

Works in all shells. Does not require a test. Handles like an assertion. Show Sample Output
This is sample output - yours may be different.
```
sh: VAR: unset variable
```
-1

: ${VAR:?unset variable}

arcege · 2009-09-14 19:41:01 4
SCP files to remote server using PEM file
This is sample output - yours may be different.
-1

scp -i /path/to/file.pem [local-files] root@[dest-host]:[dest-path]

mariusbutuc · 2011-08-24 18:47:44 7

OMG, you are a Gentoo junkie. -funroll-loops-me-harder ;-) http://ccache.samba.org/ ccache is a compiler cache, which speeds up your compiler on successive runs, because it caches intermediate compiled output. Show Sample Output

-1

watch ccache -s

piyo · 2009-02-13 17:16:32 12

Use dig instead of nslookup

It is a much better tool then nslookup for getting information about the any site.It has got better capability too.For reverse information please use the switch "-x" and the ip address. Show Sample Output

-1

dig google.com

unixbhaskar · 2009-08-28 04:32:52 3

Find files older than 60 days
This is sample output - yours may be different.
-1

find . -maxdepth 1 -type f -mtime +60 -ls

mack · 2011-04-26 01:11:07 7
Show all TODOs and a few relative lines after it.

This will recursively go through every file under the current directory showing all lines containing "TODO" as well as 10 lines after it. The output will be marked with line numbers to make it easier to find where the TODO is in the actual file.
This is sample output - yours may be different.
-1

grep -rnA 10 TODO *

blockcipher · 2011-09-28 16:26:14 3
Graphic mode for root

Just tape: sudo -s your passwd startx -- :1
This is sample output - yours may be different.
-1

startx -- :1

sudo · 2009-02-13 17:22:13 13
Put the wireless card into monitor mode

First you need to instal aircrack-ng Use this command if you need to put your wireless card into monitor mode. interface = wlan0 || wifi0 || ath0 et ceatera... channel = 6, 11, 10, 9 et ceatera
This is sample output - yours may be different.
-1

airmon-ng start <interface> <channel>

jie · 2009-02-18 11:46:36 8
Find a specific pdf file (given part of its name) and open it

This assumes there is only one result. Either tail your search for one result or add | head -n 1 before the closing bracket. You can also use locate instead of find, if you have locate installed and updated
This is sample output - yours may be different.
-1

evince "$(find -name 'NameOfPdf.pdf')"

RBerenguel · 2010-04-04 20:55:51 5
MS-DOS only: Enable variable expansion from inside of FOR loops with !varname!

Usually the MS-DOS cmd.exe processes in the whole FOR loop as one command and expands each var like %varname% in before (except the loop var of course). This command enables expansion of other vars than only the loop var during the FOR loop. The syntax of the var to expand is then !varname! inside the FOR loop. Use command endlocal to end the setlocal command. E.g. (only works from batch files, not from commandline directly): @echo off setlocal enabledelayedexpansion FOR %%A IN (*) DO ( set file=%%A echo !file! ) endlocal
This is sample output - yours may be different.
-1

setlocal enabledelayedexpansion

Marco · 2010-08-10 12:26:43 6
Singularize all files in a directory

Jan Nelson from Grockit came up with this for us when we needed to rename all of our fixtures.
This is sample output - yours may be different.
-1

for x in *s.yml; do mv $x `echo $x | sed 's/s\.yml/\.yml/'`; done

foobarfighter · 2009-03-10 17:51:19 11
Grep for a TAB

Grep for a TAB . -- www.fir3net.com --
This is sample output - yours may be different.
-1

grep $'\t' file.txt

felix001 · 2009-10-08 23:14:14 3
Find and delete thunderbird's msf files to make your profile work quickly again.
This is sample output - yours may be different.
-1

find ~/.thunderbird/*.default/ -name *.msf -print0 | xargs --no-run-if-empty -0 rm;

tersmitten · 2010-06-07 12:34:21 3
Remove all .svn folders

Removing .svn directories without a pipe
This is sample output - yours may be different.
-1

find . -name .svn -type d -exec rm -rf {} \;

PhillipNordwall · 2010-12-15 18:51:08 5
calculate sqrt(2) ==> 1.414213
This is sample output - yours may be different.
-1

dc -e '6k2vp'

kev · 2012-03-08 13:04:00 3
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Easy way to scroll up und down to change to one of n last visited directories.

This alias is meant to append n (here is n=10) most recently used cd commands to the bottom of history file. This way you can easily change to one of previous visited directories simply by hitting 1-10 times arrow up key. Hint: You can make more aliases implying the same rule for any set of frequently used long and complex commands like: mkisof, rdesktop, gpg...

Run a command multiple times with different subcommands

it's nice to be able to use the command `ls program.{h,c,cpp}`. This expands to `ls program.h program.c program.cpp`. Note: This is a text expansion, not a shell wildcard type expansion that looks at matching file names to calculate the expansion. More details at http://www.linuxjournal.com/content/bash-brace-expansion I often run multiple commands (like apt-get) one after the other with different subcommands. Just for fun this wraps the whole thing into a single line that uses brace expansion.

give a binary the ability to open ports below 1024 as non root user

Binding a server to privileged port on Linux w/o running as root This is applicable to any service using privileged ports (< 1024), for instance to run a HTTP server on port 80 or a LDAP directory server on port 389 for example.

print text in color red

eg: $printTextInColorRed foo bar foo bar [in red color]

Scan a document to PDF

Adjust the --resolution and --mode as required (if these options are available for your scanner). The size options (-x, -y, -imageheight, -imagewidth) are for US letter paper. For A4, I think the command would be: $scanimage -p --resolution 250 --mode Gray -x 210 -y 297 | pnmtops -imageheight 11.7 -imagewidth 8.3 | ps2pdf - output.pdf

Backup files older than 1 day on /home/dir, gzip them, moving old file to a dated file.

Useful for backing up old files, custom logs, etc. via a cronjob.

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Exclude inserting a table from a sql import

Starting with a large MySQL dump file (*.sql) remove any lines that have inserts for the specified table. Sometimes one or two tables are very large and uneeded, eg. log tables. To exclude multiple tables you can get fancy with sed, or just run the command again on subsequently generated files.

check open ports without netstat or lsof

Netcat & Tar

Create a tarball on the client and send it across the network with netcat on port 1234 where its extracted on the server in the current directory.

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