Commands using echo (1,545)
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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.
0for USER in /var/spool/cron/*; do echo "--- crontab for $USER ---"; cat "$USER"; done -
Count how many times a pattern is present into a stream. It can be one or more lines. No overlapping. It means searching for aa on aaa will output 1 not 2.
0echo something | awk '{ total += gsub(/yourstring/,"") } END { print total }' -
I still don't know why mutt (or offlineimap or whatever in between), is borking the encoding of my files, but this fixes it. Show Sample Output
0fix_saved_files() { for i in "$@" ; do mv $i $(php -r '$or = "'$i'"; mb_internal_encoding("UTF-8"); echo mb_decode_mimeheader($or) . "\n";') ; done; } -
Tells you where's left and right. Handy if you can't ever remember them. Show Sample Output
0alias left='echo -n "<-left"; for I in $(seq 1 $(($(stty size | cut -d " " -f 2) - 13))); do echo -n " " ; done ; echo -n "right->";' -
It will list your machine's ethernet ports speed Show Sample Output
0for d in $(cd /sys/class/net && echo eth?) ; do echo "$d: $(ethtool $d |grep -w Speed)"; done -
0find . -type f -exec echo -n "touch -t \`echo " \; -exec echo -n {} \; -exec echo -n " | sed -E 's/.*([[:digit:]]{8})_([[:digit:]]{4})([[:digit:]]{2}).*/\1\2.\3/g'\` " \; -exec echo {} \; | sh
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Given a list of filenames, one per line, in /tmp/filelist, calculate the total sum disk usage.
0LISTCOUNT=0; LISTSIZE=0; cat /tmp/filelist | while read FF; do FILESIZE=$(stat -c%s "$FF"); LISTSIZE=$[LISTSIZE+${FILESIZE}]; echo listsize: $LISTSIZE; LISTCOUNT=$[LISTCOUNT+1]; echo listcount: $LISTCOUNT; done | tail -2 -
Appends 4 configuration lines to your ~/.inputrc which allow you to seach history taking into account the characters you have typed so far. It is taken straight form https://help.ubuntu.com/community/UsingTheTerminal Go there for a complete description (grep for "Incremental history searching"). Not sure about the limits of this (which OS's/terminals), but probably anything unix/linux like will do. Changed my life :) Show Sample Output
0echo '\n"\e[A": history-search-backward\n"\e[B": history-search-forward\n"\e[C": forward-char\n"\e[D": backward-char\n' >> ~/.inputrc -
0nc 127.0.0.1 22 < /dev/null; echo $?
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Just 253 chars of pure UNIX magic, with curl. I created this contrived bash one-liner while building a command-line bash game : www.rubegoldbash.com. Show Sample Output
0curl -s ip.appspot.com | xargs -n 1 curl -s "freegeoip.net/csv/$1" | cut -d ',' -f '9 10' | sed 's/,/\&lon=/g' | xargs -n 1 echo "http://api.openweathermap.org/data/2.5/weather?mode=html&lat=$1" | sed 's/ //g' | xargs -n 1 curl -s $1 | lynx -stdin -dump -
This provides better, but not perfect, distribution, and it works for 2^32 ≤ X ≤ 2^64. (A robust distribution requires iteration/recursion and an indeterminate amount of randomness.)
0(od -An -t u8 -N8 </dev/urandom; echo X '* 2 64^/1+p') | dc -
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
0cat ~/.ssh/id_rsa.pub | ssh user@hostname 'cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys && chmod 700 ~/.ssh && echo "Host key copied"' -
This helps me determine which repo I want to use for downloading ISO files Show Sample Output
0cat repos.txt | while read line; do echo $line | cut -d"/" -f 3 | fping -e ;done -
usage = crontest "/path/to/bin" This version of this function will echo back the entire command so it can be copied/pasted to crontab. Should be able to be automagically appended to crontab with a bit more work. Tested on bash and zsh on linux,freebsd,aix Show Sample Output
0crontest () { date +'%M %k %d %m *' |awk 'BEGIN {ORS="\t"} {print $1+2,$2,$3,$4,$5,$6}'; echo $1;} -
If you want to create new user accounts in OS X from the command line use this fragment to find the next free user id. In OS X CLI you have to assign the user id yourself Show Sample Output
0echo $((1+$( dscl . -list /Users UniqueID| awk '{print $2}' | sort -rn | head -1 ))) -
that's how I do it in ubuntu
0echo test $DISPLAY > /dev/null || export DISPLAY=:0.0; xset dpms force off;gnome-screensaver-command -l -
The leading plus sign is removed - Minus sign is left intact Show Sample Output
0awk '{print $0+0}' <(echo -2; echo +3;) -
You may use another wordlist generator as regldg or whatever ./regldg '--debug-code=1' '--universe-set=7' '--universe-checking=3' '--max-length=8' '--readable-output' '--num-words-output=100' "(B|b)(n|N)(g|G)(4|a|A)(l|L)"
0crunch 7 7 Bbe3EnNGga4AlLa4A | while read line; do keytool -list -storetype PKCS12 -keystore /path/to/file.pfx -storepass $line; if [ $? -eq 0 ]; then echo $line; break; fi; done; -
0find -maxdepth 1 -type d | while read dir; do count=$(find "$dir" -regextype posix-extended -iregex '.*\.(jpg|gif|png|jpeg)' | wc -l); echo "$dir ; $count"; done
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s/espeak/say/ on a mac
0echo $(date +%m) past $(date +%H) | espeak -
perl version of "Wait for file to stop changing" When "FileName" has not been changed for last 10 seconds, then print "DONE" "10" in "(stat)[10]" means ctime. One have other options like atime, mtime and others. http://perldoc.perl.org/functions/stat.html
0echo FileName | perl -nlE'sleep 1 while time-(stat)[10]<10' && echo DONE -
Quick OneLiner to sniff for ICMP traffic, proof of concept socket code. Needs root privs to run. Show Sample Output
0echo "exec(\"import socket, os\nwhile True:\n\tprint (socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_ICMP)).recvfrom(65565)\")" | sudo python -
Keep retrying YOURCOMMAND until it succeeds. Add sleep between retries so that +c works. (Though you can always use +z and kill %1). Source: http://stackoverflow.com/a/5274386/2175968
0until YOURCOMMAND; do echo "Retrying"; sleep 2; done -
grep -v '\(/dev/\|pipe:\|socket:\)' seemingly looks a bit complicated. This can, of course, be replaced by head -1. However, it is not sure whether the filename line will be first on all systems, so I chose the safer way by filtering out what is not needed here. Show Sample Output
0media="$(basename "$(readlink /proc/$(pidof mplayer)/fd/* | grep -v '\(/dev/\|pipe:\|socket:\)')")" && ((test -n "$media" && echo "now playing: $media") || echo "no track/video playing") -
tr ' ' '\n' isn't needed, it's just there to make the output prettier. Show Sample Output
0echo {{a..z},{A..Z},{0..9}}{{a..z},{A..Z},{0..9}}{{a..z},{A..Z},{0..9}} | tr ' ' '\n' - ‹ First < 44 45 46 47 48 > Last ›
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