Commands using cat (514)
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-3cat file.txt | sendmail -F myname -f admin@mysite.com guest@guest.com
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-3cat .ssh/id_rsa.pub | ssh user@server "cat >>.ssh/authorized_keys2"
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Values will depend on the driver and the hardware specifics, so you need to refer to your driver documentation for proper interpretation of those values. Show Sample Output
-3watch -n 1 cat /proc/net/wireless -
This command is useful for separating a text file where all the words are in one line. Any group of spaces will be replaced with a single newline. Instead of one long line of tokens. You'll have a long list of tokens. One token per line.
-4cat file.txt|perl -ne '$_=~s/\s+/\n/g; print $_;' -
how to get full cpu info of your (linux) box Show Sample Output
-4cat /proc/cpuinfo -
Easy way to find out what Debian version your machine is running Show Sample Output
-4cat /etc/debian_version -
cat - concatenate MP3 files and save it... Show Sample Output
-4# cat file1.mp3 file2.mp3 > file3.mp3 -
the last person who posted used the most roundabout way to concatinate files, there's a reason there's a "conCATinate" command... Using this method, you also get to choose the order of the files, below another person just did *.txt > combined.txt which is fine but the order depends on the implementation of "cat" which is probably alphabetical order of filenames. Show Sample Output
-4cat file1 ... fileN > combinedFile; -
Matrix Screen HPUX
-4while :; do integer i=0; COL=$((RANDOM%$(tput cols))); ROW=$((RANDOM%$(tput cols))); while (( i <= COL)) do tput cup $i $ROW; echo "\033[1;34m" $(cat /dev/urandom | head -1 | cut -c1-1) 2>/dev/null; i=$(expr $i + 1); done done -
This command kills all wine instances and each EXE application working on a PC. Here is command info: 1) ps ax > processes = save process list to file named "processes" (we save it because we don't wont egrep to be found in the future) 2) cat processes | egrep "*.exe |*exe]" = shows the file "processes" and after greps for each *.exe and *exe] in it 3) | awk '{ print $1 }' > pstokill = saves processes PID's to file "pstokill" using awk filter 4) kill $(cat pstokill) = kills each PID in file pstokill, which is shown by cat program 5) rm processes && rm pstokill = removes temporary files Show Sample Output
-4ps ax > processes && cat processes | egrep "*.exe |*exe]" | awk '{ print $1 }' > pstokill && kill $(cat pstokill) && rm processes && rm pstokill -
Count your source and header file's line numbers For example for java change the command like this find . -name '*.java' -exec cat {} \;|wc -l Show Sample Output
-4find /usr/include/ -name '*.[c|h]pp' -o -name '*.[ch]' -exec cat {} \;|wc -l -
no need for a for loop when cat takes multiple arguments
-4cat * -
for passwordless login
-4cat .ssh/id_rsa.pub | ssh user@server 'cat >> ~/.ssh/authorized_keys2' -
CPU flags: rm --> 16-bit processor (real mode) tm --> 32-bit processor (? mode) lm --> 64-bit processor (long mode)
-4if [[ lm = $(cat /proc/cpuinfo | grep " lm ") ]] ; then echo "64 bits" ; else echo "32 bits" ; fi -
-4cat /dev/ttyS2 | hexdump -C
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This find files of name like *.log and truncates them.
-5logs=$(find . -name *.log);for log in $logs; do cat /dev/null > $log;done -
Ok so it's rellay useless line and I sorry for that, furthermore that's nothing optimized at all... At the beginning I didn't managed by using netstat -p to print out which process was handling that open port 4444, I realize at the end I was not root and security restrictions applied ;p It's nevertheless a (good ?) way to see how ps(tree) works, as it acts exactly the same way by reading in /proc So for a specific port, this line returns the calling command line of every thread that handle the associated socket
-5p=$(netstat -nate 2>/dev/null | awk '/LISTEN/ {gsub (/.*:/, "", $4); if ($4 == "4444") {print $8}}'); for i in $(ls /proc/|grep "^[1-9]"); do [[ $(ls -l /proc/$i/fd/|grep socket|sed -e 's|.*\[\(.*\)\]|\1|'|grep $p) ]] && cat /proc/$i/cmdline && echo; done -
-5while true; do wget -r -l1 --no-clobber -A.txt http://911.wikileaks.org/files/index.html; done; cat *.txt | grep pass
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-5for file in `find . -iname "FILENAME"`; do cat $file | sed "s/SEARCH_STRING/REPLACE_STRING/" > $file.tmp; mv $file.tmp $file; done
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In exemple, screen can bind keys to switch between windows. I like to use Ctrl + Arrow to move left or right window. So I bind like this in .screenrc : bindkey ^[OD prev # Ctl-left, prev window bindkey ^[OC next # Ctl-right, next window Show Sample Output
-5cat > /dev/null -
Will rot 13 whatever parameter follows 'rot13', whether it is a string or a file. Additionally, it will rot 5 each digit in a number
-5function rot13 { if [ -r $1 ]; then cat $1 | tr '[N-ZA-Mn-za-m5-90-4]' '[A-Za-z0-9]'; else echo $* | tr '[N-ZA-Mn-za-m5-90-4]' '[A-Za-z0-9]'; fi } -
if you want to replace "foo" with "bar" in all files in a folder, and put the resulting files into a new subfolder
-5mkdir replaced;for i in *; do cat "$i"| sed 's/foo/bar/' > "replaced/$i"; done -
-5cat file.txt | grep -v /$ > newfile.txt
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-5cat files |sed 's/.\(.*\)/\1/'
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-6cat /etc/*issue
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