Commands matching tr (1,491)

  • Rapidly invoke an editor to write a long, complex, or tricky command

    Next time you are using your shell, try typing ctrl-x e (that is holding control key press x and then e). The shell will take what you've written on the command line thus far and paste it into the editor specified by $EDITOR. Then you can edit at leisure using all the powerful macros and commands of vi, emacs, nano, or whatever. Show Sample Output


    547
    ctrl-x e
    fool · 2009-03-11 09:26:05 193
  • type partial command, kill this command, check something you forgot, yank the command, resume typing.

    Example : vim /etc/fstab ## damn <ctrl+u> sudo <ctrl+y> ## like a boss. Example 2 : sudo vim /root/bin/ ##uh... autocomplete doesn't work... <ctrl+u> sudo ls /root/bin ##ah! that's the name of the file! <ctrl+y> sudo vim /root/bin/ ##resume here! Thanks readline!


    223
    <ctrl+u> [...] <ctrl+y>
    adeverteuil · 2010-07-23 03:33:46 34
  • Clear the terminal screen


    191
    ctrl-l
    mrttlemonde · 2009-03-18 17:38:49 518
  • A very simple and useful stopwatch

    time read -sn1 (s:silent, n:number of characters. Press any character to stop)


    167
    time read (ctrl-d to stop)
    mrttlemonde · 2009-03-20 22:50:06 44
  • Matrix Style


    67
    tr -c "[:digit:]" " " < /dev/urandom | dd cbs=$COLUMNS conv=unblock | GREP_COLOR="1;32" grep --color "[^ ]"
    allinurl · 2009-06-30 17:23:49 25
  • Google Translate

    Usage: translate <phrase> <source-language> <output-language> Example: translate hello en es See this for a list of language codes: http://en.wikipedia.org/wiki/List_of_ISO_639-1_codes Show Sample Output


    65
    translate(){ wget -qO- "http://ajax.googleapis.com/ajax/services/language/translate?v=1.0&q=$1&langpair=$2|${3:-en}" | sed 's/.*"translatedText":"\([^"]*\)".*}/\1\n/'; }
    matthewbauer · 2010-03-08 03:15:48 85
  • A fun thing to do with ram is actually open it up and take a peek. This command will show you all the string (plain text) values in ram


    64
    sudo dd if=/dev/mem | cat | strings
    logik · 2009-02-09 18:29:33 27
  • intercept stdout/stderr of another process


    59
    strace -ff -e trace=write -e write=1,2 -p SOME_PID
    oernii2 · 2010-04-20 08:55:54 11
  • Generate a random password 30 characters long

    Find random strings within /dev/urandom. Using grep filter to just Alphanumeric characters, and then print the first 30 and remove all the line feeds. Show Sample Output


    54
    strings /dev/urandom | grep -o '[[:alnum:]]' | head -n 30 | tr -d '\n'; echo
    jbcurtis · 2009-02-16 00:39:28 27
  • Nice weather forecast on your shell

    Change Seville for your prefered city. Show Sample Output


    48
    curl wttr.in/seville
    nordri · 2016-08-28 09:43:38 33
  • Check your unread Gmail from the command line

    Checks the Gmail ATOM feed for your account, parses it and outputs a list of unread messages. For some reason sed gets stuck on OS X, so here's a Perl version for the Mac: curl -u username:password --silent "https://mail.google.com/mail/feed/atom" | tr -d '\n' | awk -F '<entry>' '{for (i=2; i<=NF; i++) {print $i}}' | perl -pe 's/^<title>(.*)<\/title>.*<name>(.*)<\/name>.*$/$2 - $1/' If you want to see the name of the last person, who added a message to the conversation, change the greediness of the operators like this: curl -u username:password --silent "https://mail.google.com/mail/feed/atom" | tr -d '\n' | awk -F '<entry>' '{for (i=2; i<=NF; i++) {print $i}}' | perl -pe 's/^<title>(.*)<\/title>.*?<name>(.*?)<\/name>.*$/$2 - $1/' Show Sample Output


    47
    curl -u username:password --silent "https://mail.google.com/mail/feed/atom" | tr -d '\n' | awk -F '<entry>' '{for (i=2; i<=NF; i++) {print $i}}' | sed -n "s/<title>\(.*\)<\/title.*name>\(.*\)<\/name>.*/\2 - \1/p"
    postrational · 2009-09-07 21:56:40 46
  • Google text-to-speech in mp3 format

    EDIT: command updated to support accented characters! Works in any of 58 google supported languages (some sound like crap, english is the best IMO). You get a mp3 file containing your query in spoken language. There is a limit of 100 characters for the "q" parameter, so be careful. The "tl" parameter contains target language.


    37
    wget -q -U Mozilla -O output.mp3 "http://translate.google.com/translate_tts?ie=UTF-8&tl=en&q=hello+world
    sairon · 2011-03-08 14:05:36 23
  • Download Youtube video with wget!

    Nothing special required, just wget, sed & tr! Show Sample Output


    36
    wget http://www.youtube.com/watch?v=dQw4w9WgXcQ -qO- | sed -n "/fmt_url_map/{s/[\'\"\|]/\n/g;p}" | sed -n '/^fmt_url_map/,/videoplayback/p' | sed -e :a -e '$q;N;5,$D;ba' | tr -d '\n' | sed -e 's/\(.*\),\(.\)\{1,3\}/\1/' | wget -i - -O surprise.flv
    Eno · 2011-01-25 04:19:06 22
  • Convert Youtube videos to MP3

    youtube-dl has this functionality built in. If you're running an older version of youtube-dl, you can update it using `youtube-dl -U` (although if you have an older version, it probably doesn't download youtube videos anyway.) youtube-dl --help will show you other options that may come in useful.


    34
    youtube-dl -t --extract-audio --audio-format mp3 YOUTUBE_URL_HERE
    menachem · 2011-11-15 20:11:20 18
  • Use tee to process a pipe with two or more processes

    Tee can be used to split a pipe into multiple streams for one or more process to work it. You can add more " >()" for even more fun. Show Sample Output


    34
    echo "tee can split a pipe in two"|tee >(rev) >(tr ' ' '_')
    axelabs · 2010-08-14 20:38:59 9
  • Block known dirty hosts from reaching your machine

    Blacklisted is a compiled list of all known dirty hosts (botnets, spammers, bruteforcers, etc.) which is updated on an hourly basis. This command will get the list and create the rules for you, if you want them automatically blocked, append |sh to the end of the command line. It's a more practical solution to block all and allow in specifics however, there are many who don't or can't do this which is where this script will come in handy. For those using ipfw, a quick fix would be {print "add deny ip from "$1" to any}. Posted in the sample output are the top two entries. Be advised the blacklisted file itself filters out RFC1918 addresses (10.x.x.x, 172.16-31.x.x, 192.168.x.x) however, it is advisable you check/parse the list before you implement the rules Show Sample Output


    33
    wget -qO - http://infiltrated.net/blacklisted|awk '!/#|[a-z]/&&/./{print "iptables -A INPUT -s "$1" -j DROP"}'
    sil · 2009-02-18 16:08:23 21
  • Given a file path, unplug the USB device on which the file is located (the file must be on an USB device !)

    You have an external USB drive or key. Apply this command (using the file path of anything on your device) and it will simulate the unplug of this device. If you just want the port, just type : echo $(sudo lshw -businfo | grep -B 1 -m 1 $(df "/path/to/file" | tail -1 | awk '{print $1}' | cut -c 6-8) | head -n 1 | awk '{print $1}' | cut -c 5- | tr ":" "-") Show Sample Output


    30
    echo $(sudo lshw -businfo | grep -B 1 -m 1 $(df "/path/to/file" | tail -1 | awk '{print $1}' | cut -c 6-8) | head -n 1 | awk '{print $1}' | cut -c 5- | tr ":" "-") | sudo tee /sys/bus/usb/drivers/usb/unbind
    tweet78 · 2014-04-06 12:06:29 19
  • notify yourself when a long-running command which has ALREADY STARTED is finished

    If you want to be notified when a long-running command is finished, but you have already started it: CTRL+Z fg; echo "finished" | sendmail me@example.com I use a script to post a tweet, which sends me a txt: fg; echo "finished" | tweet


    29
    <ctrl+z> fg; notify_me
    recursiverse · 2010-05-20 16:16:43 12
  • A fun thing to do with ram is actually open it up and take a peek. This command will show you all the string (plain text) values in ram

    cat? dd? RTFM


    27
    sudo strings /dev/mem
    point_to_null · 2009-08-09 02:07:26 12
  • Use lynx to run repeating website actions

    This command will tell lynx to read keystrokes from the specified file - which can be used in a cronjob to auto-login on websites that give you points for logging in once a day *cough cough* (which is why I used -accept_all_cookies). For creating your keystroke file, use: lynx -cmd_log yourfile


    26
    lynx -accept_all_cookies -cmd_script=/your/keystroke-file
    Alanceil · 2009-03-17 00:38:36 13
  • Instead of writing a multiline if/then/else/fi construct you can do that by one line

    instead of writing: if [[ "$1" == "$2" ]]; then echo "$1 is equal $2" else echo "$1 differs from $2" fi do write: [[ "$1" == "$2" ]] && echo "$1 is equal $2" || echo "$1 differs from $2"


    26
    [[ test_condition ]] && if_true_do_this || otherwise_do_that
    stallmer · 2009-02-20 21:45:21 26
  • check the status of 'dd' in progress (OS X)

    Sends SIGINFO to the process. This is a BSD feature OS X inherited. You must have the terminal window executing dd selected when entering CTRL + T for this to work. Show Sample Output


    25
    CTRL + T
    unixmonkey44467 · 2012-12-19 02:21:41 20
  • recursive search and replace old with new string, inside files

    recursively traverse the directory structure from . down, look for string "oldstring" in all files, and replace it with "newstring", wherever found also: grep -rl oldstring . |xargs perl -pi~ -e 's/oldstring/newstring'


    25
    $ grep -rl oldstring . |xargs sed -i -e 's/oldstring/newstring/'
    netfortius · 2009-03-03 20:10:19 26
  • Switch 2 characters on a command line.

    If you typed 'sl', put the cursor on the 'l' and hit ctrl-t to get 'ls'.


    25
    ctrl-t
    betsubetsu · 2009-02-20 17:38:49 13
  • Recover a deleted file

    grep searches through a file and prints out all the lines that match some pattern. Here, the pattern is some string that is known to be in the deleted file. The more specific this string can be, the better. The file being searched by grep (/dev/sda1) is the partition of the hard drive the deleted file used to reside in. The ?-a? flag tells grep to treat the hard drive partition, which is actually a binary file, as text. Since recovering the entire file would be nice instead of just the lines that are already known, context control is used. The flags ?-B 25 -A 100? tell grep to print out 25 lines before a match and 100 lines after a match. Be conservative with estimates on these numbers to ensure the entire file is included (when in doubt, guess bigger numbers). Excess data is easy to trim out of results, but if you find yourself with a truncated or incomplete file, you need to do this all over again. Finally, the ?> results.txt? instructs the computer to store the output of grep in a file called results.txt. Source: http://spin.atomicobject.com/2010/08/18/undelete?utm_source=y-combinator&utm_medium=social-media&utm_campaign=technical


    24
    grep -a -B 25 -A 100 'some string in the file' /dev/sda1 > results.txt
    olalonde · 2010-08-19 20:07:42 18
  •  1 2 3 >  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

Compare two directory trees.
This uses Bash's "process substitution" feature to compare (using diff) the output of two different process pipelines.

Rename .JPG to .jpg recursively
This command is useful for renaming a clipart, pic gallery or your photo collection. It will only change the big caps to small ones (on the extension).

a function to find the fastest DNS server
http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

See OpenVZ Container id's of top 10 running processes by %cpu
This command will list the PID, VEID, and Name of the 10 highest cpu using processes on a openvz host. You must have vzpid installed.

command to change the exif date time of a image

increase recursively the modification time for a list of files
Increase the modification date for the files selected with the find command.

Check the current price of Bitcoin in USD

Indent a one-liner.
Bash builtin type also indents the function.

Adding Prefix to File name

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: