Commands using cat (514)
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0cat File.txt | grep -io 'http://www.acme.com/a/files/.*.pdf'| uniq
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0if [ -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
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same as above, however without the chmod, you wont be able to SSH to the machine as the openssh server will require tigther permissions
0cat ~/.ssh/id_rsa.pub | ssh user@machine "mkdir ~/.ssh; cat >> ~/.ssh/authorized_keys; chmod -R ~/.ssh" -
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 -
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 -
0cat /dev/urandom | strings | grep -o '[[:alnum:]]' | head -n 15 | tr -d '\n'; echo
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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 -
Add this to your bash profile, then quickly & easily (regex) search for and highlight keywords, with full text output.
0function search() { cat ${@:1} | grep --color=always -E "$1|$" } -
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) .zshrc0diff <(ssh $remote_site cat $file) $file -
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
0function 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 ; } -
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 "$1" | sed '1s/^/a,b,c,d,e,f,g,h,j,k,l,m,n,o,p\n/' | column -s , -tn | nl -v 0 ; }
0cat FILE.csv |sed -e '1i,,,,,' |sed -e 's/=sum/@sum/g' -e 's/=SUM/@SUM/g' |psc -k -d, |sed -e 's/\"@SUM(/@SUM(/' -e 's/)"/)/' -e '/@SUM/ { s/rightstring/let/; }' -e '/= "=/s/rightstring/let/' -e '/= "=/s/"//g' -e 's/= =/= /g' |sc -
0echo "text to prepend" | cat - file
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Need to change values of 'field 1'...'field 3' to column names. input_file.tsv is the tab file you want to conver output_file.json is the file that is created with the json output. Assumes your tsv has no headers.
0export FIELDS=field_1,field_2,field_3; cat input_file.tsv| ruby -rjson -ne 'puts ENV["FIELDS"].split(",").zip($_.strip.split("\t")).inject({}){|h,x| h[x[0]]=x[1];h}.to_json' > output_file.json -
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
0cat /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 -
0echo or cat something | grep -Po '(?<=text_before).*(?=text_after)'
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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
0cat $(echo "ls /proc/{`pidof firefox | sed -e 's/$/,/' -e 's/ /,/g'`}/smaps 2>/dev/null" | bash) | awk '/Rss/{sum += $2; } END{print sum, "KB"}' -
4.1.6-1-ARCH Info cpu
0cat /proc/cpuinfo | less -
Files contain operating system identification data Show Sample Output
0cat /etc/os-release -
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
0find . -iname "*.xml" | xargs cat | grep '<bean[^>]\+id=' | sed 's/.*id="\([^"]\+\)".*/\1/g' | sort | uniq -u -
0cat /proc/meminfo
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0find . -type f -name '*.csv' -exec cat {} + >> merged.csv
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Useful to see login name, UID, GID, home dir, and login shells of all users. Show Sample Output
0cat /etc/passwd | column -nts : -
rhyme timemimerhyme lowrezJuarez0rhyme() { { cat /usr/share/dict/words; printf %s\\n "$1"; } | rev | sort | rev | grep -FxC15 -e "${1?}" | grep -Fxve "$1" | shuf -n1; } -
This command is useful for sending mp3-sound by the quick way using SSH.
0cat /home/user/file.mp3 | ssh -C user@host mpg123 - - ‹ First < 13 14 15 16 17 > Last ›
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