Commands using cat (514)
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0cat file.txt | while read line; do printf "%7.2f -> %7.2f\n" $line; done
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Well its just appending your public key to the remote hosts authorized_keys, but can get messy logging in and out
0cat ~/.ssh/id_rsa.pub | ssh <remote_host> "xargs --null echo >> ~/.ssh/authorized_keys" -
If you're on a system that doesn't have nl, you can use cat -n.
0ps aux | grep [h]ttpd | cat -n -
Col 1 is swapped sum in kb Col 2 is pid of process Col 3 is command that was issued Show Sample Output
0for i in $(ps -ef | awk '{print $2}') ; { swp=$( awk '/Swap/{sum+=$2} END {print sum}' /proc/$i/smaps ); if [[ -n $swp && 0 != $swp ]] ; then echo -n "\n $swp $i "; cat /proc/$i/cmdline ; fi; } | sort -nr -
when someone mail you his ssh public key, and the lines are broken with '\n', you can reconstruct a new file with one key by line with this command. Show Sample Output
0cat authorized_keys_with_broken_lines | sed 's,^ssh,%ssh,' | tr '\n' '\0' | tr '%' '\n' | sed '1d' | sed "/^$/d" > authorized_keys -
A quick way of know the temperature info. Show Sample Output
0cat /proc/acpi/thermal_zone/*/temperature -
Get a list of all the unique hostnames from the apache configuration files. Handy to see what sites are running on a server.
0cat /etc/apache2/sites-enabled/* | egrep 'ServerAlias|ServerName' | tr -s " " | sed 's/^[ ]//g' | uniq | cut -d ' ' -f 2 | sed 's/www.//g' | sort | uniq -
0cat /proc/acpi/ac_adapter/ACAD/state
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Probably the most info for the least work. Show Sample Output
0cat /proc/acpi/battery/BAT0/state -
This command allows you to stream your log files, including gziped files, into one stream which can be piped to awk or some other command for analysis. Note: if your version of 'find' supports it, use:
find /var/log/apache2 -name 'access.log*gz' -exec zcat {} + -or -name 'access.log*' -exec cat {} +0find /var/log/apache2 -name 'access.log*gz' -exec zcat {} \; -or -name 'access.log*' -exec cat {} \; -
0cat $(ls -c | grep ogg | tac ) > directory/test.ogg
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0cat b1.avi b2.avi b3.avi b4.avi b5.avi b6.avi b7.avi > output.avi; mencoder -forceidx -oac copy -ovc copy output.avi -o output_final.avi; rm output.avi
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At times I find that I need to loop through a file where each value that I need to do something with is not on a separate line, but rather separated with a ":" or a ";". In this instance, I create a loop within which I define 'IFS' to be something other than a whitespace character. In this example, I iterate through a file which only has one line, and several fields separated with ":". The counter helps me define how many times I want to repeat the loop.
0while [[ COUNTER -le 10 && IFS=':' ]]; do for LINE in $(cat /tmp/list); do some_command(s) $LINE; done; COUNTER=$((COUNTER+1)); done -
This will you combine the DDP output of DVD Studio Pro back into a standard ISO disk image so that you can double-check the DDP output process.
0cat dvd_output/Layer0/IMAGE.DAT dvd_output/Layer1/IMAGE.DAT > dvd.iso -
0cat /proc/version
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Kills all process that belongs to the user that runs it - excluding bash, sshd (so putty/ssh session will be spared). The bit that says grep -vE "..." can be extended to include ps line patterns that you want to spare. If no process can be found on the hitlist, it will print # NOTHING TO KILL. Otherwise, it will print # KILL EM ALL, with the cull list.
0ps -u $USER -lf | grep -vE "\-bash|sshd|ps|grep|PPID" > .tmpkill; if (( $(cat .tmpkill | wc -l) > 0 )); then echo "# KILL EM ALL"; cat .tmpkill; cat .tmpkill | awk '{print $4}' | xargs kill -9; else echo "# NOTHING TO KILL"; fi; cat .tmpkill; rm .tmpkill; -
Apply to almost linux distroes. Show Sample Output
0cat /etc/services | egrep [[:blank:]]<port_number>/ -
Nice neat feedback showing contact infomation for as many domains as you wish to feed it. I used a list of domains, each one on a new line as supplied by our registar, as we needed to check they were all upto date and back them up as we are updating them all.
0whois -H $(cat ./list_of_domains) | awk 'BEGIN{RS=""}/Registrant/,/Registration Service Provider:/ {print} END{print "----------------\n"}' -
Nice command for when you don't have scp available for whatever reason. Works with binaries.
0cat LOCALFILE | ssh HOST "cat > REMOTEFILE" -
This may be listed already but this command is useful to untar a specific directory to a different server.
0cat tarfile.tar.gz | ssh server.com " cd /tmp; tar xvzf - directory/i/want" -
Concatenate file1 and file2, define paragraph, and search within each paragraph the ones containing the search string, and print just these paragraphs! Show Sample Output
0cat file1 file2| sed -e /^$/d -e /paragraph delimiter/G | sed -e '/./{H;$!d;}' -e 'x;/'."string to search".'/!d;'' -
Change your exported xml love list from last.fm, into Song: songname Artist: artistname Show Sample Output
0cat username_lovedtracks.xspf |perl -pe "s/.*<title>(.*)<\/title><creator>(.*)<\/creator>.*/Song: \1 Artist: \2/gi"> titles -
An advanced possibility to count the lines of code like in #8394 Show Sample Output
0find . -type f -name '*.php' | xargs cat | sed -re ':top /\/\*.*\*\// { s/\/\*.*\*\///g ; t top }; /\/\*/ { N ; b top }' | awk '$0 !~ /^[\t[:space:]]*($|(\/\/)|(#))/' | wc -l -
Put this command on /etc/rc.local.
0nohup cat /dev/ttyS0 | tee -a llamadas.db& -
Add DuckDuckGo Search as search provider on gnome-shell/gnome3 . Needs root permission. To see the results, use alt+f2 and then type r.
0cd /usr/share/gnome-shell/search_providers/ && cat google.xml | sed "s/www.google.com\/search/duckduckgo.com\//; s/Google/DuckDuckGo/g" > duckduckgo.xml - ‹ First < 9 10 11 12 13 > Last ›
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