Commands using cat (514)
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0find . -type f -name "*.*" -exec cat {} > totalLines 2> /dev/null \; && wc -l totalLines && rm totalLines
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0pdftk 1.pdf 2.pdf cat output 12.pdf
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0pdftk A=1.pdf B=2.pdf C=3.pdf cat C A output CA.pdf
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0sed G input.txt | cat -s
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this alternative shows the differences as they occur so that they are made plain Show Sample Output
0while true; do iptables -nvL > /tmp/now; diff -U0 /tmp/prev /tmp/now > /tmp/diff; clear; cat /tmp/diff; mv /tmp/now /tmp/prev; slee p 1; done -
This will be very helpful when you are debugging shell scripts, where you don?t want to display the echo statement and interested in only looking at the error messages. Similarly use 2> to supress error messages Show Sample Output
0cat file.txt > /dev/null -
0cat ~/.bash_history | perl -lane 'if($F[0] eq "sudo"){$hash{$F[1]}++}else{$hash{$F[0]}++};$all++;END {@top = map {[$_, $hash{$_}]} sort {$hash{$b}<=>$hash{$a}} keys %hash;printf("%10s%10d%10.2f%%\n", $_->[0],$_->[1],$_->[1]/$all*100) for @top[0..9]}'
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chmod authorized_keys so you don't get "Authentication refused: bad ownership or modes for file /home/user/.ssh/authorized_keys"
0cat ~/.ssh/id_rsa.pub | ssh tester@10.2.6.10 "mkdir -p ~/.ssh; cat >> ~/.ssh/authorized_keys; chmod 600 ~/.ssh/authorized_keys" -
chmod authorized_keys so you don't get "Authentication refused: bad ownership or modes for file /home/user/.ssh/authorized_keys"
0cat ~/.ssh/id_rsa.pub | ssh tester@10.2.6.10 "mkdir -p ~/.ssh; cat >> ~/.ssh/authorized_keys; chmod 600 ~/.ssh/authorized_keys" -
Extract all href links from an HTML document with sed and grep Show Sample Output
0cat index.html | grep -o '<a .*href=.*>' | sed -e 's/<a /\n<a /g' | sed -e 's/<a .*href=['"'"'"]//' -e 's/["'"'"'].*$//' -e '/^$/ d' -
works where perl works, because the awk version is gnu awk only. Show Sample Output
0cat log | perl -ne 'use POSIX; s/([\d.]+)/strftime "%y-%m-%d %H:%M:%S", localtime $1/e,print if /./' -
Given a file with the format of 'git log --pretty=short', search in last 100 commits for one with the same description. I used this when after a rebase I had to find out the new commit ids. The second sed replaces all special characters with dots so they don't mess up the grep later on. Show Sample Output
0cat /tmp/commit_list | { while read old_commit ; do msg="`git log --pretty=oneline $old_commit'^'..$old_commit | sed 's/[0-9a-f]* //' | sed 's/[^A-Za-z0-9]/./g'`"; git log --pretty=oneline HEAD@'{100}'..HEAD | grep "$msg" ; done ; } -
0diff -u <(ssh -t user@host1 sudo cat /dir1/file1) <(ssh -t user@host2 sudo cat /dir2/file2)
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0cd ~/.msf4/loot && cat *mscache* | cut -d '"' -f 2,4 | sed s/\"/\:/g | tr -cd '\11\12\40-\176' | grep -v Username | cut -d : -f 1,2 | awk -F':' '{print $2,$1}' | sed 's/ /:/g' > final.dcc.hash
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Watch file's contents that is getting overwritten Show Sample Output
0while sleep 1; do clear; cat /tmp/whatever.cue; done -
0cat myfile | tee dest1 dest2 > /dev/null 2>&1
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0cat list.txt | pax -wd > archive.tar
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Convert Metasploit?s MSCACHE output to Hashcat version (performed in ~/.msf4/loot/):
0cat *mscache* | awk -F '"' '{print $4":"$2}' -
Kind of fun if you're that was inclined. I figured most of my commands start with s. sudo, screen, ssh etc. This script tells me what else they start with. Show Sample Output
0for i in {a..z}; do echo $(cat ~/.bash_history | grep ^$i.* | wc -l) $i; done | sort -n -r -
0cat item_list | xargs -n1 -P<n> process_item
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Replace "user/sbin/sshd" with the file you would like to check. If you are doing this due to intrusion, you obviously would want to check size, last modification date and md5 of the md5sum application itself. Also, note that "/var/lib/dpkg/info/*.md5sums" files might have been tampered with themselves. Neither to say, this is a useful command. Show Sample Output
0cat /var/lib/dpkg/info/*.md5sums|grep usr/sbin/sshd|sed 's,usr,/usr,'|md5sum -c -
This exports all lines of input file as environment variables, assuming each line is like these: OH=YEAH FU=UUUU
0while read line; do export $line; done < <(cat input) -
0cat /sys/block/{*,*/*}/holders/dm*/dm/name | awk -F- '{print $1}' | sort -u
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0cat /sys/block/md1/holders/dm*/dm/name | awk -F- '{print $1}' | sort -u
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remove old index.html if you download it again and organiaz the java script tag on the file index.html
0rm index.html | wget www.google.com;cat index.html | sed 's/<script>/\n\n\<script>\n\n/g' | sed 's/<\/script>/>\n\n/g' - ‹ First < 11 12 13 14 15 > Last ›
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