Commands using cat (514)
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cut log from row 100 to row 150.
0cat -n install | head -n 150 | tac | head -n 50 | tac -
cut log from line 50 to line 88
0cat -n install.log | head -88 | tac | head -n $(( 88 - 50 )) | tac -
0cat file.gz.cpt *[a-z] | ccdecrypt -k yoursecretpassword | tar -xzf -
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0cat domainlist.txt | while read line; do echo -ne $line; whois $line | grep Expiration ; done | sed 's:Expiration Date::'
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Where filein is the source file, destination.com is the ssh server im copying the file to, -c arcfour,blowfish-cbc is selecting the fastest encryption engines, -C is for online compressions and decompression when it comes off the line - supposed to speed up tx in some cases, then the /tmp/fileout is how the file is saved... I talk more about it on my site, where there is more room to talk about this: http://www.kossboss.com/linuxtarpvncssh and http://www.kossboss.com/linux---transfer-1-file-with-ssh Show Sample Output
0cat filein | ssh destination.com -c arcfour,blowfish-cbc -C -p 50005 "cat - > /tmp/fileout" -
0colordiff <(ssh user@host cat /etc/ssh/sshd_config) /etc/ssh/sshd_config
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0cat /dev/cdrom > ~/img.iso
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This command is used to verify a sha256sum-formatted file hash list on IBM AIX or any other UNIX-like OS that has openssl but doesn't have sha256sum by default. Steps: 1: Save to the filesystem a script that: A: Receives as arguments the two parts of one line of a sha256sum listing B: Feeds a file into openssl on SHA256 standard input hash calculation mode, and saves the result C: Compares the calculated hash against the one received as argument D: Outputs the result in a sha256sum-like format 2: Make the script runnable 3: Feed the sha256sum listing to xargs, running the aforementioned script and passing 2 arguments at a time Show Sample Output
0echo '#! /usr/bin/ksh\ncat $2 | openssl dgst -sha256 | read hashish; if [[ $hashish = $1 ]]; then echo $2: OK; else echo $2: FAILED; fi;' > shacheck; chmod +x shacheck; cat hashishes.sha256 | xargs -n 2 ./shacheck; -
0du -ah | sort -hr | head -n50 | cat -n
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"find ./ ..." could be replaced with "find $PWD ..." to display absolute path instead of relative path. Show Sample Output
0find ./ -type f -size +500k -exec ls -1Ash {} \; | sort -hr | cat -n -
0cat file | paste -s -d'%' - | sed 's/\(^\|$\)/"/g;s/%/","/g'
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0cat some-image.html | nc -v -l -p 12345
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With this command, you can check the difference between the volumes mounted and the volume in /etc/fstab.
0diff <(cat /etc/fstab | grep vol | grep -v "^#" | awk '{print $1}') <(df -h | grep vol) -
A TCP server that keeps the same socket open, sending the contents of "file" repeatedly.
0while true; do cat "file"; done | nc -v -l 1337 -
0cat cachedump.txt | awk -F : '{print $2":"$1}'
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Many circumstances call for creating variable of a summary result while still printing the original pipe. Inserting "tee >(cat >&2)" allows the command output to still be printed while permitting the same output to be processed into a variable. Show Sample Output
0num_errs=`grep ERROR /var/log/syslog | tee >(cat >&2) | wc -l` -
Lost your luks passphrase? You can always bruteforce from the command line. See the sample output, a simple command using a dictionary. Show Sample Output
0cat dictionary.txt|while read a; do echo $a|cryptsetup luksOpen /dev/sda5 sda5 $a && echo KEY FOUND: $a; done -
Found it online and could be very useful
0for i in $(cat vulns.txt); do echo $i; rpm -qa ?changelog | grep -i $i; done -
0cat ~/.ssh/id_rsa.pub | ssh deployer@xxxxx -p 52201 'cat >> ~/.ssh/authorized_keys'
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This is the command line I use to get my IP address in order to update my zoneedit account. Full script on my blog http://akim.sissaoui.com/linux-attitude/script-de-mise-a-jour-ddns-zoneedit-com-en-bashsh/ Show Sample Output
0$ wget --no-check-certificate -q checkip.dyndns.org -O index.html && cat index.html|cut -d ' ' -f 6 | cut -d '<' -f 1 -
Replace "APIKEY" with your public apikey Show Sample Output
0cat h.txt| while read line; do curl -s -X POST 'https://www.virustotal.com/vtapi/v2/file/report' --form apikey="APIKEY" --form resource="$line"|awk -F'positives\":' '{print "VTHits"$2}'|awk -F' ' '{print $1" "$2$5$6}'|sed 's/["}]//g' && sleep 15; done -
0w !sudo cat >%
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0cat /var/log/syslog | grep score= | awk '{print $15}' | more
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Monitoring system in one line : DISK : disk space MEM: memory ( mem , swap, Total) CPU : all information about cpu activity LOAD : load average Show Sample Output
0echo "DISK:";df -Pl | grep -v "Filesystem" | awk '{print $5,$6}' ; echo "MEM:" ; free -mto | awk '{ print $1,$2,$3,$4 }'; echo "CPU:"; top -b -d1 -n1 | grep Cpu | awk '{print $2,$3,$4,$5,$6,$7,$8,$9}';echo "LOAD:"; cat /proc/loadavg -
Allows you to have a list of the domains on the server.
0cat /etc/named.conf | grep -Po '(?<=(named/)).*(?=\.db)' - ‹ First < 12 13 14 15 16 > Last ›
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