Commands tagged sed (376)

  • Extract title from HTML files

    This command can be used to extract the title defined in HTML pages


    3
    sed -n 's/.*<title>\(.*\)<\/title>.*/\1/ip;T;q' file.html
    octopus · 2010-04-19 07:41:10 4
  • View advanced Sort options, Quick Reference Help Alias

    Once you get into advanced/optimized scripts, functions, or cli usage, you will use the sort command alot. The options are difficult to master/memorize however, and when you use sort commands as much as I do (some examples below), it's useful to have the help available with a simple alias. I love this alias as I never seem to remember all the options for sort, and I use sort like crazy (much better than uniq for example). # Sorts by file permissions find . -maxdepth 1 -printf '%.5m %10M %p\n' | sort -k1 -r -g -bS 20% 00761 drwxrw---x ./tmp 00755 drwxr-xr-x . 00701 drwx-----x ./askapache-m 00644 -rw-r--r-- ./.htaccess # Shows uniq history fast history 1000 | sed 's/^[0-9 ]*//' | sort -fubdS 50% exec bash -lxv export TERM=putty-256color Taken from my http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html Show Sample Output


    3
    alias sorth='sort --help|sed -n "/^ *-[^-]/s/^ *\(-[^ ]* -[^ ]*\) *\(.*\)/\1:\2/p"|column -ts":"'
    AskApache · 2010-06-10 21:30:31 9
  • STAT Function showing ALL info, stat options, and descriptions

    This shows every bit of information that stat can get for any file, dir, fifo, etc. It's great because it also shows the format and explains it for each format option. If you just want stat help, create this handy alias 'stath' to display all format options with explanations. alias stath="stat --h|sed '/Th/,/NO/!d;/%/!d'" To display on 2 lines: ( F=/etc/screenrc N=c IFS=$'\n'; for L in $(sed 's/%Z./%Z\n/'<<<`stat --h|sed -n '/^ *%/s/^ *%\(.\).*$/\1:%\1/p'`); do G=$(echo "stat -$N '$L' \"$F\""); eval $G; N=fc;done; ) For a similarly powerful stat-like function optimized for pretty output (and can sort by any field), check out the "lll" function http://www.commandlinefu.com/commands/view/5815/advanced-ls-output-using-find-for-formattedsortable-file-stat-info From my .bash_profile -> http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html Show Sample Output


    3
    statt(){ C=c;stat --h|sed '/Th/,/NO/!d;/%/!d'|while read l;do p=${l/% */};[ $p == %Z ]&&C=fc&&echo ^FS:^;echo "`stat -$C $p \"$1\"` ^$p^${l#%* }";done|column -ts^; }
    AskApache · 2010-06-11 23:31:03 3
  • Check your unread Gmail from the command line

    Just an alternative with more advanced formating for readability purpose. It now uses colors (too much for me but it's a kind of proof-of-concept), and adjust columns. Show Sample Output


    3
    curl -u username --silent "https://mail.google.com/mail/feed/atom" | awk 'BEGIN{FS="\n";RS="(</entry>\n)?<entry>"}NR!=1{print "\033[1;31m"$9"\033[0;32m ("$10")\033[0m:\t\033[1;33m"$2"\033[0m"}' | sed -e 's,<[^>]*>,,g' | column -t -s $'\t'
    frntn · 2011-10-15 23:15:52 3
  • append empty line after every line in file.txt


    3
    sed G file.txt
    kev · 2011-10-26 15:14:24 5
  • Prepend a text to a file.

    Syntax: $ prepend content to add [filename] Uses ed, so no temp files created.


    3
    prepend () { array=("$@"); len=${#array[@]}; file=${array[$len-1]}; text=${array[@]:0:$len-1}; printf '%s\n' 0a "$text" . w | ed -s "$file"; }
    zlemini · 2013-12-09 21:59:26 7
  • List your largest installed packages (on Debian/Ubuntu)


    3
    dpkg-query -W --showformat='${Installed-Size}\t${Package}\n' | sort -nr | less
    dfear · 2014-01-06 01:11:36 10
  • Create a bash script from last commands

    In order to write bash-scripts, I often do the task manually to see how it works. I type ### at the start of my session. The function fetches the commands from the last occurrence of '###', excluding the function call. You could prefix this with a here-document to have a proper script-header. Delete some lines, add a few variables and a loop, and you're ready to go. This function could probably be much shorter...


    3
    quickscript () { filename="$1"; history | cut -c 8- | sed -e '/^###/{h;d};H;$!d;x' | sed '$d' > ${filename:?No filename given} }
    joedhon · 2014-02-09 12:19:29 6
  • Extract rpm package name, version and release using some fancy sed regex

    This command could seem pretty pointless especially when you can get the same result more easily using the rpm builtin queryformat, like: rpm -qa --qf "%{NAME} %{VERSION} %{RELEASE}.%{ARCH}\n" | sort | column -t but nonetheless I've learned that sometimes it can be quite interesting trying to explore alternative ways to accomplish the same task (as Perl folks like to say: There's more than one way to do it!) Show Sample Output


    3
    rpm -qa | sed 's/^\(.*\)-\([^-]\{1,\}\)-\([^-]\{1,\}\)$/\1 \2 \3/' | sort | column -t
    acavagni · 2019-03-14 21:11:45 34
  • Graphical tree of sub-directories with files

    The command finds every item within the directory and edits the output so that subdirectories are and files are output much like the tree command Show Sample Output


    3
    find . -print | sed -e 's;[^/]*/;|-- ;g;s;-- |; |;g'
    jonavon · 2019-09-25 17:49:35 128
  • Replace all forward slashes with backward slashes

    Use -i option to edit directly a file: sed -i 's|\/|\\|g' file Show Sample Output


    3
    echo '/usr/bin/' | sed 's|\/|\\|g'
    bugmenot · 2021-07-15 20:09:34 243
  • Get a range on line with sed (first two)

    Get the two first lines of a file and quit. Show Sample Output


    3
    sed -n '1,2p;3q' file
    bugmenot · 2021-07-16 07:29:15 219
  • Remove leading zeros in multiple columns with sed

    Leading zeros might help correct sorting and they can be removed by sed after sorting Show Sample Output


    2
    sed 's/\b\(0*\)//g' filename
    alperyilmaz · 2009-03-24 20:19:42 10
  • Get Futurama quotations from slashdot.org servers


    2
    lynx -head -dump http://slashdot.org|egrep 'Bender|Fry'|sed 's/X-//'
    linuxrawkstar · 2009-07-30 19:53:16 3
  • Ultimate current directory usage command

    Based on the MrMerry one, just add some visuals and sort directory and files


    2
    find . -maxdepth 1 -type d|xargs du -a --max-depth=0|sort -rn|cut -d/ -f2|sed '1d'|while read i;do echo "$(du -h --max-depth=0 "$i")/";done;find . -maxdepth 1 -type f|xargs du -a|sort -rn|cut -d/ -f2|sed '$d'|while read i;do du -h "$i";done
    nickwe · 2009-09-03 20:33:21 5
  • fetch all revisions of a specific file in an SVN repository

    Manages everything through one sed script instead of pipes of greps and awks. Quoting of shell variables is generally easier within a sed script.


    2
    svn log fileName | sed -ne "/^r\([0-9][0-9]*\).*/{;s//\1/;s/.*/svn cat fileName@& > fileName.r&/p;}" | sh -s
    arcege · 2009-09-04 17:23:45 3
  • preprocess code to be posted in comments on this site

    Assuming that $script contains the filename of a script you'd like to post as part of a comment on this site, this will prefix each line with '$' and pipe it into the X selection. From there just put the cursor in the right place in the comments box and middle-click. Should work pretty much anywhere with xclip installed. On debian-ish systems this is installed as part of the package "xclip".


    2
    sed 's/^/$ /' "$script" | xclip
    intuited · 2009-09-13 11:21:54 31
  • Outputs a 10-digit random number


    2
    head -c4 /dev/urandom | od -N4 -tu4 | sed -ne '1s/.* //p'
    opexxx · 2009-10-08 11:27:20 4
  • Grab an interface's IP from ifconfig without screen clutter

    Sometimes, you don't really care about all the other information that ifconfig spits at you (however useful it may otherwise be). You just want an IP. This strips out all the crap and gives you exactly what you want. Show Sample Output


    2
    ifconfig eth1 | grep inet\ addr | awk '{print $2}' | cut -d: -f2 | sed s/^/eth1:\ /g
    BoxingOctopus · 2009-11-03 19:26:40 10
  • geoip information

    A function that takes a domain name as an argument Show Sample Output


    2
    geo(){ curl -s "http://www.geody.com/geoip.php?ip=$(dig +short $1)"| sed '/^IP:/!d;s/<[^>][^>]*>//g'; }
    dennisw · 2009-11-12 17:14:09 25
  • Sed can refference parts of the pattern in the replacement:

    Show Sample Output


    2
    echo -e "swap=me\n1=2"|sed 's/\(.*\)=\(.*\)/\2=\1/g'
    axelabs · 2010-01-16 22:01:37 3
  • display a one-liner of current nagios exit statuses. great with netcat/irccat


    2
    grep current_state= /var/log/nagios/status.dat|sort|uniq -c|sed -e "s/[\t ]*\([0-9]*\).*current_state=\([0-9]*\)/\2:\1/"|tr "\n" " "
    c3w · 2010-03-11 06:04:14 3
  • Working random fact generator

    extension to tali713's random fact generator. It takes the output & sends it to notify-osd. Display time is proportional to the lengh of the fact.


    2
    wget randomfunfacts.com -O - 2>/dev/null | grep \<strong\> | sed "s;^.*<i>\(.*\)</i>.*$;\1;" | while read FUNFACT; do notify-send -t $((1000+300*`echo -n $FUNFACT | wc -w`)) -i gtk-dialog-info "RandomFunFact" "$FUNFACT"; done
    mtron · 2010-04-02 09:43:32 4
  • print java packages by using unix tree and sed

    if you need a quick way of printing out all the packages that contain classes this command will print the directory structure and replace '/' with '.' It will also ignore CVS directories (we use CVS here)


    2
    tree -d -I 'CVS' -f -i | sed 's/\//./g' | sed 's/\.\.//g'
    ducleotide · 2010-05-03 09:00:13 7
  • Viewing Top Processes according to cpu, mem, swap size, etc.

    I've wanted this for a long time, finally just sat down and came up with it. This shows you the sorted output of ps in a pretty format perfect for cron or startup scripts. You can sort by changing the k -vsz to k -pmem for example to sort by memory instead. If you want a function, here's one from my http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html aa_top_ps(){ local T N=${1:-10};T=${2:-vsz}; ps wwo pid,user,group,vsize:8,size:8,sz:6,rss:6,pmem:7,pcpu:7,time:7,wchan,sched=,stat,flags,comm,args k -${T} -A|sed -u "/^ *PID/d;${N}q"; } Show Sample Output


    2
    command ps wwo pid,user,group,vsize:8,size:8,sz:6,rss:6,pmem:7,pcpu:7,time:7,wchan,sched=,stat,flags,comm,args k -vsz -A|sed -u '/^ *PID/d;10q'
    AskApache · 2010-05-18 18:41:38 6
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List the Sizes of Folders and Directories
I wanted an easy way to list out the sizes of directories and all of the contents of those directories recursively.

To get you started!
Do it.

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"

Clear filesystem memory cache
Found here: http://ubuntuforums.org/showthread.php?t=589975

Add directory to $PATH if it's not already there
Sometimes in a script you want to make sure that a directory is in the path, and add it in if it's not already there. In this example, $dir contains the new directory you want to add to the path if it's not already present. There are multiple ways to do this, but this one is a nice clean shell-internal approach. I based it on http://stackoverflow.com/a/1397020. You can also do it using tr to separate the path into lines and grep -x to look for exact matches, like this: $ if ! $(echo "$PATH" | tr ":" "\n" | grep -qx "$dir") ; then PATH=$PATH:$dir ; fi which I got from http://stackoverflow.com/a/5048977. Or replace the "echo | tr" part with a shell parameter expansion, like $ if ! $(echo "${PATH//:/$'\n'}" | grep -qx "$dir") ; then PATH=$PATH:$dir ; fi which I got from http://www.commandlinefu.com/commands/view/3209/. There are also other more regex-y ways to do it, but I find the ones listed here easiest to follow. Note some of this is specific to the bash shell.

Lists the size of certain file in every 10 seconds
watch is a command especially designed for doing this job

back ssh from firewalled hosts
host B (you) redirects a modem port (62220) to his local ssh. host A is a remote machine (the ones that issues the ssh cmd). once connected port 5497 is in listening mode on host B. host B just do a ssh 127.0.0.1 -p 5497 -l user and reaches the remote host'ssh. This can be used also for vnc and so on.

print contents of file from first match of regex to end of file
Search in "filename" for the first line to match regex, and print to stdout from the matching line to the end of the file.

Get the Nth argument of the last command (handling spaces correctly)
Bash's history expansion character, "!", has many features, including "!:" for choosing a specific argument (or range of arguments) from the history. The gist is any number after !: is the number of the argument you want, with !:1 being the first argument and !:0 being the command. See the sample output for a few examples. For full details search for "^HISTORY EXPANSION" in the bash(1) man page.    Note that this version improves on the previous function in that it handles arguments that include whitespace correctly.

Convert df command to posix; uber GREPable
It is a pain grep-ing/sed-ing/awk-ing plain old df. POSIX it!

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