Commands using tr sorted by votes

Commands using tr (349)

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List commands with a short summary

Obviously, you can replace 'man' command with any command in this command line to do useful things. I just want to mention that there is a way to list all the commands which you can execute directly without giving fullpath. Normally all important commands will be placed in your PATH directories. This commandline uses that variable to get commands. Works in Ubuntu, will work in all 'manpage' configured *nix systems. Show Sample Output
This is sample output - yours may be different.
```
$ find `echo "${PATH}" | tr ':' ' '` -type f -a -name '*ctl*' | while read COMMAND; do man -f "${COMMAND##*/}"; done
cupsctl (8)          - configure cupsd.conf options
pactl (1)            - Control a running PulseAudio sound server
esdctl (1)           - The Enlightened Sound Daemon
sysctl (8)           - configure kernel parameters at runtime
alsactl (1)          - advanced controls for ALSA soundcard driver
pccardctl (8)        - PCMCIA card control utility
initctl (8)          - init daemon control utility
```
4

find `echo "${PATH}" | tr ':' ' '` -type f | while read COMMAND; do man -f "${COMMAND##*/}"; done

mohan43u · 2009-06-13 19:56:24 6
Create AUTH PLAIN string to test SMTP AUTH session

I use this as an alias: alias authplain "printf '\!:1\0\!:1\0\!:2' | mmencode | tr -d '\n' | sed 's/^/AUTH PLAIN /'" then.. # authplain someuser@somedomain.com secretpassword AUTH PLAIN c29tZXVzZXJAc29tZWRvbWFpbi5jb20Ac29tZXVzZXJAc29tZWRvbWFpbi5jb20Ac2VjcmV0cGFzc3dvcmQ= # Show Sample Output
This is sample output - yours may be different.
```
AUTH PLAIN dmlsbGUAdmlsbGUAc2FsYXNhbmE=
```
4

printf '\!:1\0\!:1\0\!:2' | mmencode | tr -d '\n' | sed 's/^/AUTH PLAIN /'

vwal · 2009-08-04 05:04:50 4
Generate a binary file with all ones (0xff) in it

This is similar to how you would generate a file with all zeros dd if=/dev/zero of=allzeros bs=1024 count=2k
This is sample output - yours may be different.
4

tr '\000' '\377' < /dev/zero | dd of=allones bs=1024 count=2k

azeey · 2009-12-08 16:05:28 4
Find jpeg images and copy them to a central location

Use if you have pictures all over the place and you want to copy them to a central location Synopsis: Find jpg files translate all file names to lowercase backup existing, don't overwrite, preserve mode ownership and timestamps copy to a central location
This is sample output - yours may be different.
4

find . -iname "*.jpg" -print0 | tr '[A-Z]' '[a-z]' | xargs -0 cp --backup=numbered -dp -u --target-directory {location} &

oracular · 2009-12-10 08:47:04 5
convert a line to a space
This is sample output - yours may be different.
4

cat file | tr '\n' ''

bortoelnino · 2010-02-11 07:30:29 8
generate random password (works on Mac OS X)

Prepending env LC_CTYPE=C fixes a problem with bad bytes in /dev/urandom on Mac OS X
This is sample output - yours may be different.
4

env LC_CTYPE=C tr -dc "a-zA-Z0-9-_\$\?" < /dev/urandom | head -c 10

aerickson · 2011-02-22 17:09:44 7
a fast way to repeat output a byte

the speed is about 500MB/s on my machine. i think it's fast enough to output not too many bytes. while a C program may output 1GB per sencond on my machine. if the size is not the power of 512,you may change the bs and count in dd. Show Sample Output
This is sample output - yours may be different.
```
$ time tr '\0' '\377' < /dev/zero|dd count=$((24*1024*2)) > /dev/null
49152+0 records in
49152+0 records out
25165824 bytes (25 MB) copied, 0.0491487 s, 512 MB/s
tr '\0' '\377' < /dev/zero  0.02s user 0.02s system 82% cpu 0.053 total
dd count=$((24*1024*2)) > /dev/null  0.01s user 0.03s system 76% cpu 0.052 total
```
4

tr '\0' '\377' < /dev/zero|dd count=$((<bytes>/512))

cfy · 2011-04-05 14:26:02 3
Capitalize first letter of each word in a string

Capitalize first letter of each word in a string. Show Sample Output
This is sample output - yours may be different.
```
Foo Bar
```
4

echo 'fOo BaR' | tr '[A-Z]' '[a-z]' | sed 's/$^\| $$[a-z]$/\1\u\2/g'

caiosba · 2011-09-09 21:40:31 3
switch case of a text file
This is sample output - yours may be different.
4

tr a-zA-Z A-Za-z < input.txt

putnamhill · 2012-03-06 12:59:15 4
Search and play youtube videos directly to terminal (no X needed)

pyt 'Stairway to heaven - Led Zeppelin' pyt 'brain damage - Pink Floyd' No web browser or even X needed. Just a cli and internet connection! mplayer is pauseable and can skip ahead This may break if youtube changes their search html.
This is sample output - yours may be different.
4

pyt() { id=$(curl -s 'https://www.youtube.com/results?search_query='$(tr ' ' + <<<"$1") | grep -om3 '"[[:alnum:]]\{11\}"' | awk NR==3 | tr -d \"); youtube-dl -q 'https://www.youtube.com/watch?v='"$id" -o - | mplayer -vo null /dev/fd/3 3<&0 </dev/tty; }

snipertyler · 2015-07-20 05:30:27 16
Find top 10 largest files in /var directory (subdirectories and hidden files included )

Should work even when very large files exist.
This is sample output - yours may be different.
4

tree -isafF /var|grep -v "/$"|tr '[]' ' '|sort -k1nr|head

knoppix5 · 2016-05-27 16:41:20 17
Sort files in folders alphabetically

Creates one letter folders in the current directory and moves files with corresponding initial in the folder.
This is sample output - yours may be different.
4

for i in *; do I=`echo $i|cut -c 1|tr a-z A-Z`; if [ ! -d "$I" ]; then mkdir "$I"; fi; mv "$i" "$I"/"$i"; done

z3bu · 2018-06-29 11:37:04 635

Find top 10 largest files in /var directory (subdirectories and hidden files included )

Same as above, but modified to show human readable output Show Sample Output

tree -ihafF /var | tr '[]' ' '| sort -k1hr|head -10

nv21 · 2019-04-23 22:52:45 36

get all Google ipv4/6 subnets for a iptables firewall for example (updated version)

google has added 2 more netblocks... Show Sample Output
This is sample output - yours may be different.
```
108.177.8.0/21
108.177.96.0/19
130.211.0.0/22
172.217.0.0/19
172.217.128.0/19
172.217.160.0/20
172.217.192.0/19
172.217.32.0/20
172.253.112.0/20
172.253.56.0/21
173.194.0.0/16
2001:4860:4000::/36
209.85.128.0/17
216.239.32.0/19
216.58.192.0/19
2404:6800:4000::/36
2607:f8b0:4000::/36
2800:3f0:4000::/36
2a00:1450:4000::/36
2c0f:fb50:4000::/36
35.190.247.0/24
35.191.0.0/16
64.233.160.0/19
66.102.0.0/20
66.249.80.0/20
72.14.192.0/18
74.125.0.0/16
```
4

for NETBLOCK in $(echo _netblocks.google.com _netblocks2.google.com _netblocks3.google.com); do nslookup -q=TXT $NETBLOCK ; done | tr " " "\n" | grep ^ip[46]: | cut -d: -f2- | sort

emphazer · 2019-12-16 07:09:12 288
memcache affinity: queries local memcached for stats, calculates hit/get ratio and prints it out.

queries local memcached for stats, calculates hit/get ratio and prints it out. Show Sample Output
This is sample output - yours may be different.
```
95.23223087607411631700
```
3

echo -en "stats\r\n" "quit\r\n" | nc localhost 11211 | tr -s [:cntrl:] " "| cut -f42,48 -d" " | sed "s/$[0-9]*$\s$[0-9]*$/ \2\/\1*100/" | bc -l

magictoken · 2009-02-21 15:55:37 5
Duplicating service runlevel configurations from one server to another.

And then to complete the task: Go to target host; ssh host Turn everything off: for i in `chkconfig --list | fgrep :on | awk '{print $1}'` ; do chkconfig --level 12345 $i off; done Create duplicate config: while read line; do chkconfig --level $line on; done < foo
This is sample output - yours may be different.
3

chkconfig --list | fgrep :on | sed -e 's/$^.*$*0:off/\1:/g' -e 's/$.$:on/\1/g' -e 's/.:off//g' | tr -d [:blank:] | awk -F: '{print$2,$1}' | ssh host 'cat > foo'

catawampus · 2009-05-13 21:17:39 11
SVN Status log to CSV

Note you have also the --xml option ;) Show Sample Output
This is sample output - yours may be different.
```
1 | author | 2009-09-09 12:12:12 +200 | Initial import
2 | author | 2009-09-09 12:15:16 +200 | ADDED: great feature
```
3

svn log | tr -d '\n' | sed -r 's/-{2,}/\n/g' | sed -r 's/ $[^$]+\)//g' | sed -r 's/^r//' | sed -r "s/[0-9]+ lines?//g" | sort -g

Cowboy · 2009-06-29 12:48:30 6
Generate random password

Generates password consisting of alphanumeric characters, defaults to 16 characters unless argument given. Show Sample Output
This is sample output - yours may be different.
```
frozenfire@sine:~$ randpw 10
9qDVnEYNGx
frozenfire@sine:~$ randpw
6PkWNDsFVTiuKmpX
```
3

randpw(){ < /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-16};echo;}

frozenfire · 2009-08-07 07:30:57 7
Ping sweep without NMAP

Ping sweep without NMAP
This is sample output - yours may be different.
3

for i in `seq 1 255`; do ping -c 1 10.10.10.$i | tr \\n ' ' | awk '/1 received/ {print $2}'; done

hemanth · 2009-08-22 09:34:27 12
Remove CR LF from a text file

Remove CR LF (CRLF) from a text file. use man:tr to get more info about removing other characters from a file. and even character to character replacements.
This is sample output - yours may be different.
3

tr -d '\r\n' < input_file.txt > output_file.txt

nadavkav · 2009-10-26 16:12:21 6
Show the command line of a process that use a specific port (ubuntu)
This is sample output - yours may be different.
3

cat /proc/$(lsof -ti:8888)/cmdline | tr "\0" " "

glaudiston · 2010-02-24 17:10:40 5
converting horizontal line to vertical line
This is sample output - yours may be different.
3

tr '\t' '\n' < inputfile

eastwind · 2010-03-15 08:05:41 3
Converts uppercase chars in a string to lowercase
This is sample output - yours may be different.
3

echo StrinG | tr '[:upper:]' '[:lower:]'

hm2k · 2010-04-22 15:09:49 5
Fill a hard drive with ones - like zero-fill, but the opposite :)

Note: Replace 200000 with drive bytes/512, and /dev/sdx with the destination drive/partition. ;) Note: You may need to install pipebench, this is easy with "sudo apt-get install pipebench" on Ubuntu. The reason I hunted around for the pieces to make up this command is that I wanted to specifically flip all of the bits on a new HDD, before running an Extended SMART Self-Test (actually, the second pass, as I've already done one while factory-zeroed) to ensure there are no physical faults waiting to compromise my valuable data. There were several sites that came up in a Google search which had a zero-fill command with progress indicator, and one or two with a fill-with-ones command, but none that I could find with these two things combined (I had to shuffle around the dd command(s) to get this to happen without wasting speed on an md5sum as well). For reference, these are the other useful-looking commands I found in my search: Zero-fill drive "/dev/sdx", with progress indicator and md5 verification (run sudo fdisk -l to get total disk bytes, then divide by 512 and enter the resulting value into this command for a full wipe) dd if=/dev/zero bs=512 count=<size/512> | pipebench | sudo tee /dev/sdx | md5sum And this command for creating a file filled with ones is my other main source (besides the above command and man pages, that is - I may be a Linux newbie but I do read!): tr '\000' '\377' < /dev/zero | dd of=allones bs=1024 count=2k Hope someone finds this useful! :) Cheers, - Gliktch Show Sample Output
This is sample output - yours may be different.
```
Example of dynamic operating output:
87 MB   14.84 MB/second (Wed Sep  1 01:16:35 2010)

Example of summary output on end of process:
200000+0 records in
200000+0 records out
Summary:                                                                       
Piped   97.65 MB in 00h00m10.04s:    9.72 MB/second
200000+0 records in
200000+0 records out
102400000 bytes (102 MB) copied, 10.9973 s, 9.3 MB/s
```
3

tr '\000' '\377' < /dev/zero | dd bs=512 count=200000 status=noxfer | pipebench | sudo dd of=/dev/sdx

Gliktch · 2010-08-31 15:38:27 6
List the size (in human readable form) of all sub folders from the current location
This is sample output - yours may be different.
3

du --max-depth=1|sort -n|cut -f2|tr '\n' '\0'|xargs -0 du -sh 2>/dev/null

j_melis · 2010-10-08 12:06:50 3
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Dump dvd from a different machine onto this one.

You can use this to directly dump from machine A (with dvd drive) to machine B (without dvd drive) . I used this to copy dvd using my friend's machine to my netbook. Above command is to be issued on machine B. Advantages : 1) No wasting time dumping first to machine A and then copying to Machine B. 2) You dont need to use space on Machine A. In fact, this will work even when Machine A doesnt have enough hdd space to dump the DVD. Use -C ssh option on slow networks (enables compression). you can replace "dd if=/dev/dvd" with any ripping command as long as it spews the iso to stdout.

print line and execute it in BASH

If script.sh contains only these two lines: $ uname -a $ whoami

Alternative size (human readable) of files and directories (biggest last)

using mb it's still readable;) a symbol variation $ du -ms {,.[^.]}* | sort -nk1

Output sound when your computer is downloading something

Outputs pseudo-random sounds to speakers (stereo mode because of -c 2) when there are any kind of network activity.

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

Simple Video Surveillance by email

This takes a picture (with the web cam) every 5 minutes, and send the picture to your e-mail. Some systems support mail -a "References: " so that all video surveillance emails are grouped in a single email thread. To keep your inbox clean, it is still possible to filter and move to trash video surveillance emails (and restore these emails only if you really get robbed!) For instance with Gmail, emails sent to me+trash@gmail.com can be filtered with "Matches: DeliveredTo:me+trash@gmail.com"

Automatic ssh Session Logger

A wrapper around ssh to automatically provide logging and session handling. This function runs ssh, which runs screen, which runs script. . The logs and the screen session are stored on the server. This means you can leave a session running and re-attach to it later, or from another machine. . . Requirements: * Log sessions on a remote server * Transparent - nothing extra to type * No installation - nothing to copy to the server beforehand . Features: * Function wrapper delegating to ssh - so nothing to remember - uses .ssh/config as expected - passes your command line option to ssh * Self-contained: no scripts to install on the server * Uses screen(1), so is: - detachable - re-attachable - shareable * Records session using script(1) * Configurable log file location, which may contain variables or whitespace L="$HOME" # local variable L="\$HOME" # server variable L="some space" . Limitations: * Log dir/file may not contain '~' (which would require eval on the server) . . The sessions are named by the local user connecting to the server. Therefore if you detach and re-run the same command you will reconnect to your original session. If you want to connect/share another's session simply run: $ USER=bob ssh root@server . The command above is stripped down to an absolute minimum. A fully expanded and annotated version is available as a Gist (git pastebin): https://gist.github.com/flatcap/3c42326abeb1197ee714 . If you want to add timing info to script, change the command to: $ ssh(){ L="\$HOME/logs/$(date +%F_%H:%M)-$USER";/usr/bin/ssh -t "$@" "mkdir -p \"${L%/*}\";screen -xRRS $USER script --timing=\"$L-timing\" -f \"$L\"";}

SED - Substitute string in next line

source: http://sed.sourceforge.net/sed1line.txt

Delete backward from cursor, useful when you enter the wrong password

command shell generate random strong password

shell generate random strong password

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Commands using tr (349)

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