Commands using cat sorted by votes

Commands using cat (514)

sorted by

Get all URL With Extension from File
This is sample output - yours may be different.
0

cat File.txt | grep -io 'http://www.acme.com/a/files/.*.pdf'| uniq

nedzoul · 2014-10-31 14:51:57 8
Have a user generate an ssh key if it does not already exist and spit it in bold red to stdout
This is sample output - yours may be different.
0

if [ -e ~/.ssh/id_rsa.pub ] ; then echo $'\033[1;31m' ; cat ~/.ssh/id_rsa.pub ; echo $'\033[0m' ; else ssh-keygen -t rsa -b 4096 -f ~/.ssh/id_rsa -t rsa -P ""; echo $'\033[1;31m' ; cat ~/.ssh/id_rsa.pub ; echo $'\033[0m'; fi

sdoradus · 2014-12-01 03:48:19 8
Copy your ssh public key to a server from a machine that doesn't have ssh-copy-id

same as above, however without the chmod, you wont be able to SSH to the machine as the openssh server will require tigther permissions
This is sample output - yours may be different.
0

cat ~/.ssh/id_rsa.pub | ssh user@machine "mkdir ~/.ssh; cat >> ~/.ssh/authorized_keys; chmod -R ~/.ssh"

omarrar · 2014-12-04 18:55:53 9
See crontabs for all users that have one

This is not exhaustive but after checking /etc/cron* is a good way to see if there are any other jobs any users may have set. Note: this is a repost from a comment "flatcap" made on http://www.commandlinefu.com/commands/view/3726/print-crontab-entries-for-all-the-users-that-actually-have-a-crontab#comment, for which I am grateful and I take no credit.
This is sample output - yours may be different.
0

for USER in /var/spool/cron/*; do echo "--- crontab for $USER ---"; cat "$USER"; done

tyzbit · 2014-12-11 19:48:46 15
compute the total disk space consumed by a list of files

Given a list of filenames, one per line, in /tmp/filelist, calculate the total sum disk usage.
This is sample output - yours may be different.
0

LISTCOUNT=0; LISTSIZE=0; cat /tmp/filelist | while read FF; do FILESIZE=$(stat -c%s "$FF"); LISTSIZE=$[LISTSIZE+${FILESIZE}]; echo listsize: $LISTSIZE; LISTCOUNT=$[LISTCOUNT+1]; echo listcount: $LISTCOUNT; done | tail -2

mwtzzz · 2015-01-13 00:53:04 8
Generate a random alphanumeric string (works on Mac)
This is sample output - yours may be different.
0

cat /dev/urandom | strings | grep -o '[[:alnum:]]' | head -n 15 | tr -d '\n'; echo

rekky · 2015-01-31 23:07:23 8
Copy ssh keys to user@host to enable password-less ssh logins with permissions alignment.

One liner that basically duplicates ssh-copy-id functionality by taking care of most common issues of SSH password-less ssh logins: - missing key on the remote server - braindead permissions *cough* RHEL *cough* Show Sample Output
This is sample output - yours may be different.
```
Host key copied
```
0

cat ~/.ssh/id_rsa.pub | ssh user@hostname 'cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys && chmod 700 ~/.ssh && echo "Host key copied"'

rde · 2015-02-17 01:46:03 9

This helps me determine which repo I want to use for downloading ISO files Show Sample Output

cat repos.txt | while read line; do echo $line | cut -d"/" -f 3 | fping -e ;done

rawm · 2015-02-17 06:34:07 8

search "<keyword>" <file>

Add this to your bash profile, then quickly & easily (regex) search for and highlight keywords, with full text output.
This is sample output - yours may be different.
0

function search() { cat ${@:1} | grep --color=always -E "$1|$" }

miscreant · 2015-03-18 18:34:11 40
Compare a remote file with a local file

opens the output of some command as a file so this also works with graphical editors like meld, kdiff3 etc meld <(ssh $remote_site cat .zshrc) .zshrc
This is sample output - yours may be different.
0

diff <(ssh $remote_site cat $file) $file

hal8 · 2015-05-09 11:11:56 11
Display a formated comma seperated spreadsheet .csv with letters and numbers for easy viewing and to check formula entry..

In addition one can evaluate the formulas in the venerable spreadsheet command sc, with an additional command. function csvev () { cat $1 | sed -e '1i,,,,,,,' |sed -e 's/=sum/@sum/g' -e 's/=SUM/@SUM/g' | psc -k -d, | sed -e 's/\"@SUM(/@SUM(/' -e 's/)"/)/' | sed '/@SUM/ { s/rightstring/let/; }' | sed -e '/= "=/s/rightstring/let/' -e '/= "=/s/"//g' | sed 's/= =/= /g' | sc ; } I will post this command separately as well. Show Sample Output
This is sample output - yours may be different.
```
0	a     b     c              d        e        f        g        h            j       k    l  m  n  o  p
     1	Name  Date  email          Amount1  Amount2  Amount3  Amount4  Total
     2	Erik  2015  sf@none.net    10       20       30       10       =SUM(D2:G2)
     3	joe   2014  joe@none.net   5        10       15       10       =SUM(D3:G3)
     4	jill  2015  jill@none.net  10       25       30       10       =SUM(D4:G4)
     5	                                                               =SUM(H2:H4)  =G2+G3  =H2
```
0

function sheet () { cat "$1" | sed '1s/^/a,b,c,d,e,f,g,h,j,k,l,m,n,o,p\n/' | column -s , -tn | nl -v 0 ; }

eakinc · 2015-07-13 03:14:35 9
Evaluate simple formulas in a .csv spreadsheet by converting and piping to the venerable sc.

Requires psc, sed, sc, and cat. Working with csv spreadsheets with formulas in them to evaluate the formulas using sc. View the formulas in a numbered and lettered formated in command line. function sheet () { cat "$1" | sed '1s/^/a,b,c,d,e,f,g,h,j,k,l,m,n,o,p\n/' | column -s , -tn | nl -v 0 ; }
This is sample output - yours may be different.
0

cat FILE.csv |sed -e '1i,,,,,' |sed -e 's/=sum/@sum/g' -e 's/=SUM/@SUM/g' |psc -k -d, |sed -e 's/\"@SUM(/@SUM(/' -e 's/)"/)/' -e '/@SUM/ { s/rightstring/let/; }' -e '/= "=/s/rightstring/let/' -e '/= "=/s/"//g' -e 's/= =/= /g' |sc

eakinc · 2015-07-13 04:11:31 10
Prepend text to a file
This is sample output - yours may be different.
0

echo "text to prepend" | cat - file

rahouni · 2015-07-17 11:15:34 9
tsv file to json file

Need to change values of 'field 1'...'field 3' to column names. input_file.tsv is the tab file you want to conver output_file.json is the file that is created with the json output. Assumes your tsv has no headers.
This is sample output - yours may be different.
0

export FIELDS=field_1,field_2,field_3; cat input_file.tsv| ruby -rjson -ne 'puts ENV["FIELDS"].split(",").zip($_.strip.split("\t")).inject({}){|h,x| h[x[0]]=x[1];h}.to_json' > output_file.json

prees · 2015-07-24 15:00:34 9
Outputs unique error messages from the apache log and count, sorted by frequency

Outputs unique error messages from the apache log, sorted by frequency. Tested on log format: [Wed Aug 26 00:00:00 2015] [error] [client xx.xx.xx.xx] Error message here Show Sample Output
This is sample output - yours may be different.
```
63 PHP PHP Warning: json_encode(): Invalid UTF-8 sequence in argument
10 Warning: Warning: preg_match() expects parameter 2 to be string, array given
7 PHP PHP Warning: Invalid argument supplied for foreach() in ...
5 PHP PHP Warning: implode(): Invalid arguments passed in ...
1 PHP PHP Parse error: syntax error, unexpected ',' in ...
```
0

cat /var/log/apache2/error.log | awk '{out=$9;for(i=9;i<=NF;i++){out=out" "$i}; print out}' | sed s/,\ referer.*// | sort | uniq -c | sort -nr

cmattoon · 2015-08-26 14:14:12 10
printing text between tags
This is sample output - yours may be different.
0

echo or cat something | grep -Po '(?<=text_before).*(?=text_after)'

petteriIII · 2015-09-11 09:19:57 9
Monitor memory fine-grained usage (e.g. firefox)

I have modified the original one-liner to allow it to manage multiple PIDs. However, I haven't found the way it can work properly with the watch command. NOTE: brace expand must be activated via "set -B" in order to this script can work. Show Sample Output
This is sample output - yours may be different.
```
961936 KB
```
0

cat $(echo "ls /proc/{`pidof firefox | sed -e 's/$/,/' -e 's/ /,/g'`}/smaps 2>/dev/null" | bash) | awk '/Rss/{sum += $2; } END{print sum, "KB"}'

pchalim · 2015-09-30 22:22:53 9
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
Operating system identification data

Files contain operating system identification data Show Sample Output
This is sample output - yours may be different.
```
NAME=
ID=
PRETTY_NAME=
ANSI_COLOR=
HOME_URL=
SUPPORT_URL=
```
0

cat /etc/os-release

olto · 2015-10-22 04:31:36 9
finds all bean ids in all xml files from the current folder

finds all xml files greps them for extracts the bean id sorts the ids creates a list of distinct entries, a unique list of bean ids Show Sample Output
This is sample output - yours may be different.
```
groupManager
groupPermissionsDelegate
groupPermissionsDelegate
handleResolver
hashRegistry
hazelcastCacheCompactor
hazelcastCacheConfigManager
```
0

find . -iname "*.xml" | xargs cat | grep '<bean[^>]\+id=' | sed 's/.*id="$[^"]\+$".*/\1/g' | sort | uniq -u

gruzilla · 2015-11-06 07:57:22 10
memory information
This is sample output - yours may be different.
0

cat /proc/meminfo

blasetherexaler · 2015-11-11 05:09:52 9
Merge files in current directory
This is sample output - yours may be different.
0

find . -type f -name '*.csv' -exec cat {} + >> merged.csv

swarzynski · 2015-11-19 10:06:21 10
View formatted table of users on the system

Useful to see login name, UID, GID, home dir, and login shells of all users. Show Sample Output
This is sample output - yours may be different.
```
root    x  0  0  root    /root      /bin/bash
daemon  x  1  1  daemon  /usr/sbin  /usr/sbin/nologin
bin     x  2  2  bin     /bin       /usr/sbin/nologin
```
0

cat /etc/passwd | column -nts :

HeinrichHartmann · 2015-12-08 11:24:58 10
Find Rhyming Words

rhyme time mime rhyme lowrez Juarez
This is sample output - yours may be different.
0

rhyme() { { cat /usr/share/dict/words; printf %s\\n "$1"; } | rev | sort | rev | grep -FxC15 -e "${1?}" | grep -Fxve "$1" | shuf -n1; }

lowrez · 2016-01-02 03:24:44 13
output your mp3 file over SSH on a remote computer's speaker

This command is useful for sending mp3-sound by the quick way using SSH.
This is sample output - yours may be different.
0

cat /home/user/file.mp3 | ssh -C user@host mpg123 -

Zeben · 2016-03-29 12:30:09 12
‹ First < 13 14 15 16 17 > 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

Google's Text-To-Speech in command line

Improved google text-to-speech function. Allows to specify language, plays sound in terminal. Automatically removes downloaded file after successfully processing. Usage: $ say LANGUAGE TEXT Examples: $ say en "This is a test." $ say pl "To jest test"

Rename files in batch

List your largest installed packages (on Debian/Ubuntu)

dpigs is in the package debian-goodies (debian/ubuntu)

Clean config from # and empty strings

Get debian package names corresponding to latex packages used in a document

Kill all processes that listen to ports begin with 50 (50, 50x, 50xxx,...)

Run netstat as root (via sudo) to get the ID of the process listening on the desired socket. Use awk to 1) match the entry that is the listening socket, 2) matching the exact port (bounded by leading colon and end of column), 3) remove the trailing slash and process name from the last column, and finally 4) use the system(…) command to call kill to terminate the process. Two direct commands, netstat & awk, and one forked call to kill. This does kill the specific port instead of any port that starts with 50. I consider this to be safer.

Determine space taken by files of certain type

Just how much space are those zillions of database logs taking up ? How much will you gain on a compression rate of say 80% ? This little line gives you a good start for your calculations.

Remove ( color / special / escape / ANSI ) codes, from text, with sed

Remove ( color / special / escape / ANSI ) codes, from text, with sed Credit to the original folks who I've copied this command from. The diff here is: Theirs: [m|K] Theirs is supposed to remove \E[NUMBERS;NUMBERS[m OR K] This statement is incorrect in 2 ways. 1. The letters m and K are two of more than 20+ possible letters that can end these sequences. 2. Inside []'s , OR is already assumed, so they are also looking for sequences ending with | which is not correct. This : [a-zA-Z] This resolves the "OR" issue noted above, and takes care of all sequences, as they all end with a lower or upper cased letter. This ensures 100% of any escape code 'mess' is removed.

Stripping ^M at end of each line for files

Schedule a script or command in x num hours, silently run in the background even if logged out

doesn't require "at", change the "2h" to whatever you want... (deafult unit for sleep is seconds)

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 cat

Commands using cat (514) 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 cat (514)

sorted by