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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Sort netflow packet capture

Sort netflow packet capture by unique connections excluding source port.

Resize A Mounted EXT3 File System

Live extension of an ext3 file system on logical volume $v by 200GB without the need to unmount/remount. Requires that you have 1) a version of resize2fs that contains code merged from ext2online, and 2) kernel support for online resizing. (e.g. RHEL 5)

Grab just the title of a youtube video

There's another version on here that uses GET but some people don't have lwp-request, so here's an alternative. It's also a little shorter and should work with most youtube URLs since it truncates at the first &

Octal ls

Do ls with permissions written in octal form.

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

Updating the status on identi.ca using curl.

identica is an open source social networking and micro-blogging service. Based on Laconica, a micro-blogging software package built on the OpenMicroBlogging specification. http://identi.ca/

List out classes in of all htmls in directory

Lists out all classes used in all *.html files in the currect directory. usefull for checking if you have left out any style definitions, or accidentally given a different name than you intended. ( I have an ugly habit of accidentally substituting camelCase instead of using under_scores: i would name soemthing counterBox instead of counter_box) WARNING: assumes you give classnames in between double quotes, and that you apply only one class per element.

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.

PRINT LINE the width of screen or specified using any char including Colors, Escapes and metachars

One of the first functions programmers learn is how to print a line. This is my 100% bash builtin function to do it, which makes it as optimal as a function can be. The COLUMNS environment variable is also set by bash (including bash resetting its value when you resize your term) so its very efficient. I like pretty-output in my shells and have experimented with several ways to output a line the width of the screen using a minimal amount of code. This is like version 9,000 lol. This function is what I use, though when using colors or other terminal features I create separate functions that call this one, since this is the lowest level type of function. It might be better named printl(), but since I use it so much it's more optimal to have the name contain less chars (both for my programming and for the internal workings). If you do use terminal escapes this will reset to default. $ tput sgr0 For implementation ideas, check my http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html

Keep track of diff progress

You're running a program that reads LOTS of files and takes a long time. But it doesn't tell you about its progress. First, run a command in the background, e.g. $ find /usr/share/doc -type f -exec cat {} + > output_file.txt Then run the watch command. "watch -d" highlights the changes as they happen In bash: $! is the process id (pid) of the last command run in the background. You can change this to $(pidof my_command) to watch something in particular.

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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.

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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,…):

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Commands using read (340)

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