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Replace VIM
This is sample output - yours may be different.
0

:%s/<string old>/<string new>/g

Plancton · 2015-11-10 17:05:11 10
Remove blank lines from a file using grep and save output to new file
This is sample output - yours may be different.
0

awk NF

aktau · 2017-05-24 12:08:27 17
Grep the process excluding the grep itself.
This is sample output - yours may be different.
0

ps -ef | grep [t]clsh

tensaix2j · 2009-02-25 11:21:49 8
prints line numbers

No need $_ netp ;)
This is sample output - yours may be different.
0

perl -pe 'print "$. "' <file>

sputnick · 2009-12-08 16:11:51 10
print line and execute it in BASH

since we're repeating the command there after the semicolon, we only need one backtick Show Sample Output
This is sample output - yours may be different.
```
$ echo "ls"; `!#:0-$

echo "ls"; `echo "ls" ; `
ls
Android.mk  ardrv  devmgr  egl  file1
```
0

$ echo "command"; `!#:0-$

unixmonkey20949 · 2011-04-28 17:09:25 3
Mark a directory as one where something failed

If you use colored ls(1), the broken symbolic links significantly differ from regular files and directories in the ls listing. In my case it is bright red. 0 is for getting the first place in the list.
This is sample output - yours may be different.
0

fail () { ln -s /nonexistent 0_FAIL_${1}; }

pipeliner · 2011-11-06 20:14:33 3
list with full path
This is sample output - yours may be different.
0

find `pwd` -maxdepth 1 -exec ls --color -d {} \;

kev · 2011-12-16 06:18:35 5
find all c and cpp files except the ones in the unit-test and android subdirectories

works only in zsh, requires EXTENDED_GLOB to be set.
This is sample output - yours may be different.
0

ls **/*.c(|pp)~(unit-test|android)/*

bst · 2012-04-27 07:43:22 8
Mute Master sound channel, printing only the percent volume
This is sample output - yours may be different.
0

amixer -c 0 set Master toggle | sed -n "$ p" | awk '{print $4}' | sed "s/[^0-9]//g"

dtsip · 2012-06-26 21:16:42 7
list all files are greater than 10mb

list all files are greater than 10mb lent from: http://www.tippscout.de/linux-grosze-dateien-finden_tipp_1653.html
This is sample output - yours may be different.
0

ls -lahS $(find / -type f -size +10000k)

Ichag · 2013-04-22 12:08:16 5
watch video youtube without flash but with mplayer and youtube-dl
This is sample output - yours may be different.
0

mplayer $(youtube-dl -g http://youtube.com/example)

aiki46 · 2013-12-06 15:39:23 9
Use grep to get multiple patterns.

Using egrep to search multiple patterns. Show Sample Output
This is sample output - yours may be different.
```
ERROR: This is an error message.
CRITICAL: This is a critical message.
WARNING: This is a warning message.
```
0

egrep -wi --color 'warning|error|critical'

krizzo · 2014-10-07 17:06:39 8
dd with pretty progress bar (Requires pv and dialog)
This is sample output - yours may be different.
0

(pv -n centos-7.0-1406-x86_64-DVD.img | dd of=/dev/disk4 bs=1m conv=notrunc,noerror) 2>&1 | dialog --gauge "Copying CentOS to USB Stick in /dev/disk4" 10 70 0

BoxingOctopus · 2015-01-19 19:36:15 12
Info cpu

4.1.6-1-ARCH Info cpu
This is sample output - yours may be different.
0

cat /proc/cpuinfo | less

olto · 2015-10-01 04:34:03 10
Clear DNS cache on a mac

This will clear Mac OS's DNS cache, which has been a source of issues for me in the past.
This is sample output - yours may be different.
0

sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

abeardevil · 2017-02-24 18:34:49 17
split email by @ with awk

splitting email by @ with awk Show Sample Output
This is sample output - yours may be different.
```
xxx.com
```
0

echo $mail | awk -F'@' '{print $2}'

aysadk · 2017-05-24 22:36:28 17
set open firmware password command mode

Sets the Open Firmware to ask for password when selecting a boot volume other then the hd
This is sample output - yours may be different.
0

/usr/local/bin/OFPW -mode 1

tomslick · 2009-02-18 14:48:31 5
Add all not commited files to svn
This is sample output - yours may be different.
0

svn st | grep ^? | xargs svn add 2> /dev/null

douglas · 2009-02-25 11:40:51 6
When feeling boring this command help too

sudo apt-get install bb A demoscene intro in ascii art with tracker song
This is sample output - yours may be different.
0

bb

eastwind · 2009-04-22 05:33:25 7
Poor man's unsort (randomize lines)

If you need to randomize the lines in a file, but have an old sort commands that doesn't support the -R option, this could be helpful. It's easy enough to remember so that you can create it as a script and use that. It ain't real fast. It ain't safe. It ain't super random. Do not use it on untrusted data. It requires bash for the $RANDOM variable to work. Show Sample Output
This is sample output - yours may be different.
```
$ echo -e a\\nb\\nc | while read l; do echo $RANDOM "$l"; done | sort -n | cut -d " " -f 2-
c
a
b
```
0

while read l; do echo $RANDOM "$l"; done | sort -n | cut -d " " -f 2-

ketil · 2010-02-03 22:36:34 4
simple regex spell checker

searches through the linux dictionary for the word you're trying to spell (you can use regular expressions, e.g. "< /usr/share/dict/words egrep bro[c]+o[l]+i" ) Show Sample Output
This is sample output - yours may be different.
```
onomatopoeia
onomatopoeial
onomatopoeian
```
0

< /usr/share/dict/words egrep onomatopoeia

smop · 2010-08-13 00:12:39 4
Zip a directory recursively, excluding some contained directories

This zips a directory recursively but excludes some directories within the zipped directory. Useful for excluding .svn and .git directories, or compilation targets.
This is sample output - yours may be different.
0

zip -r new.zip dir_to_zip -x '*/dir_to_exclude1/*' -x '*/dir_to_exclude2/*'

rocketraman · 2010-11-18 09:38:50 6

Pascal's triangle

see: http://en.wikipedia.org/wiki/Pascal%27s_triangle Show Sample Output

l=10;for((i=0;i<$l;i++));do eval "a$i=($(pv=1;v=1;for((j=0;j<$l;j++));do [ $i -eq 0 -o $j -eq 0 ]&&{ v=1 && pv=1; }||v=$((pv+a$((i-1))[$((j))]));echo -n "$v ";pv=$v;done;));";eval "echo \"\${a$i[@]}\"";done | column -t;

glaudiston · 2011-02-11 17:00:20 16

Download 40 top funnyjunk Images to the current directory

If your version of curl does not support the --compressed option, use curl -s http://funnyjunk.com | gunzip instead of curl -s --compressed http://funnyjunk.com
This is sample output - yours may be different.
0

curl -s --compressed http://funnyjunk.com | awk -F'"' '/ '"'"'mainpagetop24h'"'"'/ { print "http://funnyjunk.com"$4 }' | xargs curl -s | grep -o 'ht.*m/pictures/.*\.jpg\|ht.*m/gifs/.*\.gif' | grep "_......_" | uniq | xargs wget

laniner · 2011-07-21 15:57:21 6
Format images for Kindle

optipng *.png http://www.mobileread.com/forums/showpost.php?p=147076&postcount=7 -dither FloydSteinberg produces a more uniform dither than the default.
This is sample output - yours may be different.
0

mogrify -colorspace Gray -rotate '-90>' -resize 600x800 -dither FloydSteinberg -colors 16 -format png *

yoyoyojomo · 2012-02-01 17:16:52 3
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Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Remove all unused kernels with apt-get

A little aptitude magic. Note: this will remove images AND headers. If you just want to remove images: aptitude remove ?and(~i~nlinux-im ?not(~n`uname -r`)) I used this in zsh without any problems. I'm not sure how other shells will interpret some of the special characters used in the aptitude search terms. Use -s to simulate.

Check for Firewall Blockage.

This is just one method of checking to see if an IP is blocked via IP tables or CSF. Simple and to the point. Replace xx.xx.xx.xx with the IP you wish to check.

floating point operations in shell scripts

using bc is for sissies. dc is much better :-D Polish notation will rule the world...

repeat a command every one second

Short method of "while x=0; do foo ; sleep 1 ; done"

display emerge.log date in a human friendly way

gentoo only or gentoo-like linux distributions.

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"

Automagically update grub.conf labels after installing a new kernel

I like to label my grub boot options with the correct kernel version/build. After building and installing a new kernel with "make install" I had to edit my grub.conf by hand. To avoid this, I've decided to write this little command line to: 1. read the version/build part of the filename to which the kernel symlinks point 2. replace the first label lines of grub.conf grub.conf label lines must be in this format: Latest [{name}-{version/build}] Old [{name}-{version/build}] only the {version/build} part is substituted. For instance: title Latest [GNU/Linux-2.6.31-gentoo-r10.201003] would turn to title Latest [GNU/Linux-2.6.32-gentoo-r7.201004]"

Fix VirtualBox error

Figure out what shell you're running

short, sweet, and works after sudoing a new shell.

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