Commands using read sorted by votes

Commands using read (340)

sorted by

Download all data from Google Ngram Viewer

To learn more about Google Ngram Viewer: http://ngrams.googlelabs.com/info
This is sample output - yours may be different.
1

wget -qO - http://ngrams.googlelabs.com/datasets | grep -E href='(.+\.zip)' | sed -r "s/.*href='(.+\.zip)'.*/\1/" | uniq | while read line; do `wget $line`; done

sexyprout · 2010-12-20 17:46:04 207
Look up a unicode character by name

No need for further filedes or substitution for splitting. Simply use read a b
This is sample output - yours may be different.
1

grep -i "$*" /usr/lib/perl5/Unicode/CharName.pm | while read a b; do /usr/bin/printf "\u$a\tU+%s\t%s\n" "$b"; done

ioggstream · 2011-01-04 11:30:16 6

Center text in console with simple pipe like

Center the output text in max line length of buffered output pipe; Show Sample Output

center(){ l="$(cat -)"; s=$(echo -e "$l"| wc -L); echo "$l" | while read l;do j=$(((s-${#l})/2));echo "$(while ((--j>0)); do printf " ";done;)$l";done;}; ls --color=none / | center

glaudiston · 2011-02-14 16:50:35 5

Right-align text in console using pipe like ( command | right )
This is sample output - yours may be different.
1

$ right(){ l="$(cat -)"; s=$(echo -e "$l"| wc -L); echo "$l" | while read l;do j=$(((s-${#l})));echo "$(while ((j-->0)); do printf " ";done;)$l";done;}; ls --color=none / | right

glaudiston · 2011-02-14 16:58:37 9
Key binding to search commandlinefu.com

This is a simple bash function and a key binding that uses commandlinefu's simple and easy search API. It prompts for a search term, then it uses curl to search commandline fu, and highlights the search results with less.
This is sample output - yours may be different.
1

function ds { echo -n "search : "; read ST; EST=`php -r "echo rawurlencode('$ST');"`; B64=`echo -n $ST| openssl enc -base64`; curl -s "http://www.commandlinefu.com/commands/matching/$EST/$B64/plaintext" | less -p "$ST"; } ; bind '"\C-k"':"\"ds\C-m\""

cparker · 2011-02-20 23:46:16 32
sed /pat/!d without using sed (no RE; limited to shell patterns aka globbing)

POSIX requires this "string truncating" functionality. might as well use it, at least for very small tasks where invoking sed and using RE is overkill.
This is sample output - yours may be different.
1

se(){ while read a;do [ "$a" != "${a#*$@*}" ]&&echo $a;done ;} # usage: se pattern # use in place of sed /pat/!d where RE are overkill

argv · 2011-04-06 03:37:40 5
monitor your CPU core temperatures in real time

Watch the temperatures of your CPU cores in real time at the command line. Press CONTROL+C to end. GORY DETAILS: Your computer needs to support sensors (many laptops, for example, do not). You'll need to install the lm-sensors package if it isn't already installed. And it helps to run the `sensors-detect` command to set up your sensor kernel modules first. At the very end of the sensors-detect interactive shell prompt, answer YES to add the new lines to the list of kernel modules loaded at boot. Show Sample Output
This is sample output - yours may be different.
```
Core 0:      +52.0?C
Core 1:      +60.0?C
Core 2:      +53.0?C
Core 3:      +52.0?C
```
1

while :; do sensors|grep ^Core|while read x; do printf '% .23s\n' "$x"; done; sleep 1 && clear; done;

linuxrawkstar · 2011-04-20 06:41:57 7
show each new entry in system messages as a popup

It willl popup a message for each new entry in /var/log/messages found on the notify-send howto page on ubuntuforums.org. Posted here only because it is one of the favourites of mine.
This is sample output - yours may be different.
1

tail -n0 -f /var/log/messages | while read line; do notify-send "System Message" "$line"; done

hukketto · 2011-07-11 22:33:24 3
Read null character seperated fields from a file

Handle any bad named file which contains ",',\n,\b,\t,` etc Store the file name as null character separated list find . -print0 >name.lst and retrieve it using read -r -d "" Eg: find . -print0 >name.lst; cat name.lst| while IFS="" read -r -d "" file; do ls -l "$file"; done Show Sample Output
This is sample output - yours may be different.
```
-rw-r--r-- 1 totti root     1 2011-10-25 23:13 a
-rw-r--r-- 1 totti root     1 2011-10-25 23:59 a?b
drwxr-xr-x 2 totti root  4096 2011-10-25 23:00 a?b?c
-rw-r--r-- 1 totti root     1 2011-10-26 00:05 a?b.cd
-rw-r--r-- 1 totti root     6 2011-10-25 23:09 a.t
drwxr-xr-x 2 totti root  4096 2011-10-26 00:11 h"i
```
1

read -d ""

totti · 2011-10-25 18:44:11 16
Replace duplicate files by hardlinks
This is sample output - yours may be different.
1

fdupes -r -1 Neu | while read line; do j="0"; buf=""; for file in ${line[*]}; do if [ "$j" == "0" ]; then j="1"; buf=$file; else ln -f $buf $file; fi; done; done

bugmenot · 2012-01-20 22:26:54 3
Replace duplicate files by hardlinks

This variation can handle file paths containing spaces.
This is sample output - yours may be different.
1

fdupes -R -1 path | while read -r line; do (echo $line | xargs -n 1 | (first="true"; firstfile=""; while read file; do if [ "$first" == "true" ]; then first="false"; firstfile=$file; else ln --force "$firstfile" "$file"; fi; done)); done

eclewis · 2012-02-01 15:08:18 3
Check if a machine is online with better UI

I have used single packet, and in a silent mode with no display of ping stats. This is with color and UI improvement to the http://www.commandlinefu.com/commands/view/10220/check-if-a-machine-is-online. It is as per the enhancements suggested. Show Sample Output
This is sample output - yours may be different.
```
$ echo -n "IP Address or Machine Name: "; read IP; ping -c 1 -q $IP >/dev/null 2>&1 && echo -e "\e[00;32mOnline\e[00m" || echo -e "\e[00;31mOffline\e[00m"
IP Address or Machine Name: 192.168.1.1
Online

$ echo -n "IP Address or Machine Name: "; read IP; ping -c 1 -q $IP >/dev/null 2>&1 && echo -e "\e[00;32mOnline\e[00m" || echo -e "\e[00;31mOffline\e[00m"
IP Address or Machine Name: 192.168.1.2
Offline
```
1

echo -n "IP Address or Machine Name: "; read IP; ping -c 1 -q $IP >/dev/null 2>&1 && echo -e "\e[00;32mOnline\e[00m" || echo -e "\e[00;31mOffline\e[00m"

crlf · 2012-02-09 07:00:03 9
create and md5 sum of your password

create and md5 sum of your password without it showing up in your terminal or history. Afterwards we overwrite the $p variable (thx to bazzargh) Show Sample Output
This is sample output - yours may be different.
```
$ read -s p && echo -n $p | md5sum

5f4dcc3b5aa765d61d8327deb882cf99  -
```
1

read -s p && echo -n $p | md5sum;p=

hoodie · 2012-06-08 13:50:50 7
pngcrush all .png files in the directory

Nothing too magical here, just uses pngcrush to losslessly compress all your pngs!
This is sample output - yours may be different.
1

ls *.png | while read line; do pngcrush -brute $line compressed/$line; done

waffleboi9 · 2012-07-17 20:20:49 5
Hide files in ls, by adding support for .hidden files!

Sometimes I would like to see hidden files, prefix with a period, but some files or folders I never want to see (and really wish I could just remove all together). Show Sample Output
This is sample output - yours may be different.
```
ant@dev(/ntfs)# \ls -F
$RECYCLE.BIN/  System Volume Information/  Shared/

ant@dev(/ntfs)# cat .hidden
$RECYCLE.BIN
System Volume Information

ant@dev(/ntfs)# ls -F
Shared/
```
1

alias ls='if [[ -f .hidden ]]; then while read l; do opts+=(--hide="$l"); done < .hidden; fi; ls --color=auto "${opts[@]}"'

expelledboy · 2012-08-12 13:10:23 5
Count all files in directories recursively with find

Counts the files present in the different directories recursively. One only has to change maxdepth to have further insight in the directory hierarchy. Found at unix.stackexchange.com: http://unix.stackexchange.com/questions/4105/how-do-i-count-all-the-files-recursively-through-directories Show Sample Output
This is sample output - yours may be different.
```
./Data: 5011
./Data/Intensities:     3
./Data/Intensities/BaseCalls:   2
./Data/Status_Files:    28
./Data/Status_Files/RefreshBtn: 4
./Data/reports: 4978
```
1

find -maxdepth 3 -type d | while read -r dir; do printf "%s:\t" "$dir"; find "$dir" | wc -l; done

brainstorm · 2012-10-15 15:00:09 7
Recompress all files in current directory from gzip to bzip2

Find all .gz files and recompress them to bz2 on the fly. No temp files. edit: forgot the double quotes! jeez!
This is sample output - yours may be different.
1

find . -type f -name "*.gz" | while read line ; do gunzip --to-stdout "$line" | bzip2 > "$(echo $line | sed 's/gz$/bz2/g')" ; done

Kaurin · 2013-04-12 19:18:21 6
Blink Caps Lock on HDD activity

Some computers these days don't have an HDD activity light, but they still have a useless caps-lock, so why not re-purpose that light to show HDD activity? Requires setleds and dstat and probably needs to run as root.
This is sample output - yours may be different.
1

dstat -d --nocolor --noheaders|xargs --max-args=2|while read status; do if [ "$status" == "0 0" ]; then setleds -L -caps < /dev/console; else setleds -L +caps < /dev/console; fi; done

intangi · 2013-04-24 18:32:25 8
list files by testing the ownership

Alternative to mnikhil's ls/awk solution
This is sample output - yours may be different.
1

find . -user root

jedifu · 2013-10-16 08:08:41 8
Create full backups of individual folders using find and tar-gzip

Problem: I wanted to backup user data individually. In this example, all user data is located in "/mnt/storage/profiles", and about 25 folders inside, each with a username ( /mnt/storage/profiles/mike; /mnt/storage/profiles/lucy ...) I need each individual folder backed up, not the whole "/mnt/storage/profiles". So, using find while excluding directories depth and creating two variables (tarfile=username & desdir=destination), tar will create a .tgz file for each folder, resulting in a "mike_full.tgz" and "lucy_full.tgz".
This is sample output - yours may be different.
1

find /mnt/storage/profiles/ -maxdepth 1 -mindepth 1 -type d | while read d; do tarfile=`echo "$d" | cut -d "/" -f5`; destdir="/local/backupdir/"; tar -czf $destdir/"$tarfile"_full.tgz -P $d; done

jaimerosario · 2013-12-05 19:07:17 6
Create incremental backups of individual folders using find and tar-gzip

Problem: I wanted to backup user data individually, using and incremental method. In this example, all user data is located in "/mnt/storage/profiles", and about 25 folders inside, each with a username ( /mnt/storage/profiles/mike; /mnt/storage/profiles/lucy ...) I need each individual folder backed up, not the whole "/mnt/storage/profiles". So, using find while excluding directories depth and creating two variables (tarfile=username & desdir=destination), tar will create a .tgz file for each folder, resulting in a "mike_2013-12-05.tgz" and "lucy_2013-12-05.tgz".
This is sample output - yours may be different.
1

find /mnt/storage/profiles/ -maxdepth 1 -mindepth 1 -type d | while read d; do tarfile=`echo "$d" | cut -d "/" -f5`; destdir="/local/backupdir"; tar -czvf "$destdir"/"$tarfile"_`date +%F`.tgz -P $d; done

jaimerosario · 2013-12-05 19:18:03 8

Lint Git unstaged PHP files

Checks for syntax errors in PHP files modified in current working copy of a Git repository. Show Sample Output

git status -s | grep -o ' \S*php$' | while read f; do php -l $f; done

ruslan · 2013-12-14 11:47:54 8

Converts all windows .URL shortcuts in a directory to linux (gnome) .desktop shortcuts
This is sample output - yours may be different.
1

find . -name "*.URL" | while read file ; do cat "$file" | sed 's/InternetShortcut/Desktop Entry/' | sed '/^$URL\|\[$/!d' > "$file".desktop && echo "Type=Link" >> "$file".desktop ; done

pholz · 2014-01-30 09:57:08 7
List all duplicate directories

Very quick! Based only on the content sizes and the character counts of filenames. If both numbers are equal then two (or more) directories seem to be most likely identical. if in doubt apply: diff -rq path_to_dir1 path_to_dir2 AWK function taken from here: http://stackoverflow.com/questions/2912224/find-duplicates-lines-based-on-some-delimited-fileds-on-line Show Sample Output
This is sample output - yours may be different.
```
215 1320 ./hwebcam048.kopija
215 1320 ./hwebcam048
24 16 ./ac3dlx/lib/tk8.5/ttk/CVS
24 16 ./ac3dlx/lib/tk8.4/CVS
24 16 ./ac3dlx/tcl/CVS
```
1

find . -type d| while read i; do echo $(ls -1 "$i"|wc -m) $(du -s "$i"); done|sort -s -n -k1,1 -k2,2 |awk -F'[ \t]+' '{ idx=$1$2; if (array[idx] == 1) {print} else if (array[idx]) {print array[idx]; print; array[idx]=1} else {array[idx]=$0}}'

knoppix5 · 2014-02-25 22:50:09 27
Immediately put execute permission on any file saved/created in $HOME/bin
This is sample output - yours may be different.
1

inotifywait -mr -e CREATE $HOME/bin/ | while read i; do chmod +x "$(echo "$i" | sed 's/ \S* //')"; done

Sepero · 2014-03-08 19:21:53 6
‹ First < 4 5 6 7 8 > Last ›

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

Get the time from NIST.GOV

The format is JJJJJ YR-MO-DA HH:MM:SS TT L DUT1 msADV UTC(NIST) OTM and is explained more fully here: http://tf.nist.gov/service/acts.htm

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" }

Recursive search and replace (with bash only)

Replaces a string matching a pattern in one or several files found recursively in a particular folder.

Alias to securely run X from tty and close that tty afterwards.

There are different ways to run X, I prefer to run it without xdm/gdm. The problem is you can't lock X because one can press Ctrl+Alt+F1, press Ctrl+Z and kill you X locking process. Of course you can disable Ctrl+Alt* or Ctrl+Alt+Backspace keys, but it's inconvinient if you really need to switch into console.

All IP connected to my host

find all computer connected to my host through TCP connection.

Customer Friendly free

makes more sense to customers XD

Real time duplication of Apache app traffic to a second server

This takes the stream created by apache requests containing jsp and funnels them to another server. I'm using this for simulating real time traffic. The nice command gives ssh maximum CPU cycles, awk & grep strip out everything served by apache. Putting parallel on curl is important because curl is synchronous and waits for the response. Yes, I thought about using wget but it didn't seem any easier. Also, if you figure out how to run this in the background let me know. Every time I background it it stops. If you have multiple front end servers just run multiple instances of this.

Google URL shortener

(1) required: python-googl ( install by: pip install python-googl ) (2) get from google API console https://code.google.com/apis/console/

Get the SAN (subjectAltName) of a site's certificate.

Based on http://stackoverflow.com/questions/13127352/checking-alternative-names-for-a-san-ssl-cert Replace "facebook.com" with the desired hostname.

Create a video screencast (capture screen) of screen portion, with audio (the audio you hear, not your mic)

Errors in output don't matter. Stop recording: ctrl-c. Result playable with Flash too. IMPORTANT: Find a Pulse Audio device to capture from: pactl list | grep -A2 'Source #' | grep 'Name: ' | cut -d" " -f2

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 using read

Commands using read (340) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

Commands using read (340)

sorted by