Commands using read sorted by votes

Commands using read (340)

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Kill a daemon by name, not by PID

Just find out the daemon with $ netstat -atulpe. Then type in his name and he gets the SIGTERM.
This is sample output - yours may be different.
-5

kill_daemon() { echo "Daemon?"; read dm; kill -15 $(netstat -atulpe | grep $dm | cut -d '/' -f1 | awk '{print $9}') }; alias kd='kill_daemon

P17 · 2009-05-26 20:39:56 7

Credit goes to "eightmillion" Show Sample Output

-5

removedir(){ read -p "Delete the current directory $PWD ? " human;if [ "$human" = "yes" ]; then [ -z "${PWD##*/}" ] && { echo "$PWD not set" >&2;return 1;}; rm -Rf ../"${PWD##*/}"/ && cd ..; else echo "I'm watching you" | pv -qL 10; fi; }

oshazard · 2010-01-20 08:01:21 9

Short one line while loop that outputs parameterized content from one file to another
This is sample output - yours may be different.
-5

while read col1 col23; do echo $col1; done < three-column.txt > first-column.txt

infinull · 2010-07-09 03:59:20 3
Bash logger
This is sample output - yours may be different.
-5

echo -en "$USER@$HOSTNAME:${PWD##*/}> ";while read x;do echo $x>>/tmp/log.txt;echo $x|$0 2>&1;echo -en "$USER@$HOSTNAME:${PWD##*/}> ";done

Nikon · 2011-01-17 20:53:28 13
Move files matching a certain pattern to another folder
This is sample output - yours may be different.
-5

find . | grep ".*\[[Church|CPYAF].*" | while read f; do mv "$f" ../emails;done

evandrix · 2011-06-12 15:37:28 3
Access variables inside a - piped while - loop

Consider the following simple situation [ reading something using while and read ] [See script 1 in sample output] --------------------------------------------------- The variable var is assigned with "nullll" at first. Inside the while loop [piped while] it is assigned with "whillleeee". [Onlly 2 assignments stmts]. Outside the loop the last assigned value for "var" [and no variable] inside the while can't be accessed [Due to pipe, var is executed in a sub shell]. In these type of situation variables can be accessed by modifying as follows. [See script 2 in sample output] ___________________________ Vary helpful when reading a set of items, say file names, stored on a file [or variable] to an array an use it later. Is there any other way 2 access variables inside and outside the loop ?? Show Sample Output
This is sample output - yours may be different.
```
script 1
__________________
#!/bin/bash

var="nullll"
echo "var=$var"
echo
str="aa
bb
cc"

echo "$str" | while read line
do
echo "line=$line"
echo "var=$var"
var="whillleeee"

done 

echo
echo "line=$line"
echo "var=$var"



------------------------------
Output
----------------------------
var=nullll

line=aa
var=nullll
line=bb
var=whillleeee
line=cc
var=whillleeee

var=nullll
___________________________________________________________
script 2---------------------------------------------------
___________________________________________________________

#!/bin/bash

var="nullll"
echo "var=$var"
echo
str="aa
bb
cc"

while read line
do
echo "line=$line"
echo "var=$var"
var="whillleeee"

done <<< "$str"

echo
echo "var=$var"

----------------------------------
Output
------------------------------------

var=nullll

line=aa
var=nullll
line=bb
var=whillleeee
line=cc
var=whillleeee

var=whillleeee
```
-5

while read line; do echo $line; done <<< "$var"

totti · 2011-09-22 16:53:32 5
remove all spaces from all files in current folder
This is sample output - yours may be different.
-5

ls -1 | while read a; do mv "$a" `echo $a | sed -e 's/\ //g'`; done

antonangeli · 2015-10-27 12:52:47 14
Read directory contents recursively

Read all contents from current directory and display to stdout.
This is sample output - yours may be different.
-6

while read f;do echo "$f";done < <(find .)

unixmonkey8504 · 2010-03-02 14:22:22 3
Compile all C files in a directory

Compile *.c files with "gcc -Wall" in actual directory, using as output file the file name without extension.
This is sample output - yours may be different.
-7

ls *.c | while read F; do gcc -Wall -o `echo $F | cut -d . -f 1 - ` $F; done

pichinep · 2009-08-28 13:01:56 9
Simple calculus

Exit with empty line
This is sample output - yours may be different.
-7

read c; while [ -n "$c" ]; do clear; echo -e "$c = "$(echo "$c" |bc -l)"\n"; read c; done

mrttlemonde · 2011-11-13 10:28:40 9
ls -lR with a full path

I find the ouput of ls -lR to be un-satisfying (why is the path data up there?) and find syntax to be awkward. Running 'du -a' means you will have likely to trim-off filesize data before feeding filenames to the next step in the pipe.
This is sample output - yours may be different.
-8

tar -cvf /dev/null . | while read i; do ls -l $i; done

lbonanomi · 2009-09-16 16:59:15 8
Read directory contents recursively

Read all contents from current directory and display it on stdout.
This is sample output - yours may be different.
-8

find . |while read f;do echo "$f";done

unixmonkey8504 · 2010-03-02 14:21:15 7
Replace spaces with '_' in filenames

Takes filenames and directory names and replace space to '_'.
This is sample output - yours may be different.
-9

find -depth . | (while read FULLPATH; do BASENAME=`basename "${FULLPATH}"`; DIRNAME=`dirname "${FULLPATH}"`; mv "${DIRNAME}/${BASENAME}" "${DIRNAME}/${BASENAME// /_}"; done)

mohan43u · 2009-03-24 21:04:32 11
gunzip all .gz file in current dir

gunzip all .gz file in current dir
This is sample output - yours may be different.
-10

ls | grep .gz >> list.txt && cat list.txt | while read x ; do gunzip -d $x ; done && rm -rf list.txt

maccu · 2010-11-17 11:06:02 14
Combining text files into one file
This is sample output - yours may be different.
-16

ls | grep *.txt | while read file; do cat $file >> ./output.txt; done;

octopus · 2010-04-16 13:19:38 6
‹ First < 12 13 14

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Short Information about loaded kernel modules

Liked command 4077 so I improved it, by doing all text manipulation with sed. "Run this as root, it will be helpful to quickly get information about the loaded kernel modules." THX mohan43u

Short URL to commandlinefu.com commands

Obviously replace the relevant parts as required. The following also work: $ lynx cmdl.in/efu/by-marcel -or- $ lynx cmdl.in/efu/view-9058

Calculates the number of physical cores considering HyperThreading in AWK

Check whether hyperthreading is enabled or not. a better solution as nproc should work on all OS with awk

Search and replace in multiple files recursively

Replace "foo" with "bar" in all files in current directory recursively

Permanent mysql ssh tunnel to server

Open Remote Desktop (RDP) from command line having a custom screen size

This example uses xfreerdp, which builds upon the development of rdesktop. This example usage will also send you the remote machine's sound.

Trigger a command each time a file is created in a directory (inotify)

Listens for events in the directory. Each created file is displayed on stdout. Then each fileline is read by the loop and a command is run. This can be used to force permissions in a directory, as an alternative for umask. More details: http://en.positon.org/post/A-solution-to-the-umask-problem%3A-inotify-to-force-permissions

erase content from a cdrw

Blue Matrix

Same as original, but works in bash

Put a console clock in top right corner

This puts a clock in the top right of the terminal. This version doesn't use tput, but uses escape codes

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Commands using read (340)

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