Commands tagged Linux (264)
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Also resolves hostname
0nslookup . ifcfg.me -
0uchardet <filename>
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To be OS independent you should try df -Pk first (Linux) and if it does not work (that's the ||) then use df -k (e.g. for Solaris, HP UX, AIX). To get the output in a single line, use the additional cat.
0(df -Pk 2>/dev/null|| df -k) | cat -
If you are on machine 1 and want to ssh into machine 3, but you can only do so from machine 2, this will do it all in one go. Note that once you are on machine 3 and exit () it will take you directly back to machine 1
0ssh -t [email protected] "ssh -t [email protected] bash -l" -
Use this command to execute the contents of http://www.example.com/automation/remotescript.sh in the local environment. The parameters are optional. Alterrnatives to wget: CURL:
curl -s http://www.example.com/automation/remotescript.sh | bash /dev/stdin param1 param2W3M:w3m -dump http://www.example.com/automation/remotescript.sh | bash /dev/stdin [param1] [param2]LYNX:lynx -source http://www.example.com/automation/remotescript.sh | bash /dev/stdin [param1] [param2]0wget -q -O - http://www.example.com/automation/remotescript.sh | bash /dev/stdin parameter1 parameter2 -
Copy the partition table from /dev/sda to /dev/sdb. Be careful to get your drive names right.
0sfdisk -d /dev/sda | sudo sfdisk /dev/sdb -
Better than the others, and actually works unlike some of them. Show Sample Output
0objdump -d $1 | grep -Po '\s\K[a-f0-9]{2}(?=\s)' | sed 's/^/\\x/g' | perl -pe 's/\r?\n//' | sed 's/$/\n/' -
0echo "\"$(objdump -d BINARY | grep '[0-9a-f]:' | cut -d$'\t' -f2 | grep -v 'file' | tr -d " \n" | sed 's/../\\x&/g')\""
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0find / -name \*.php -exec grep -Hn preg_replace {} \;|grep /e|grep POST
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0ss -s | sed -n '/.*estab \([0-9]*\).*/s//\1/p'
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I had to reconfigure all of my 150 domains to use "localhost" as IMAP/SMTP server instead of mail.[domain]. This little thing did the job in a fraction of a second!
0sed -i -E 's/mail\..*/localhost\"/g' * -
This command telnet and and looks for a line starting with "SSH" - works for OpenSSH since the SSH banner is something like "SSH-2.0-OpenSSH_6.0p1 Debian-4+deb7u3". Then it triggers an action accordingly. It can be packed as a script file to echo 0/1 indicating the SSH service availability:
if [[ "$(sleep 1 | telnet -c <host> <port> 2>&1 | grep '^SSH')" == SSH* ]]; then echo 1; else echo 0; fi;Alternative uses: Trigger an action when server is UP (using &&):[[ "$(sleep 1 | telnet -c <host> <port> 2>&1 | grep '^SSH')" == SSH* ]] && <command when up>Trigger an action when server is DOWN (using ||):[[ "$(sleep 1 | telnet -c <host> <port> 2>&1 | grep '^SSH')" == SSH* ]] || <command when down>0$if [[ "$(sleep 1 | telnet -c <host> <port> 2>&1 | grep '^SSH')" == SSH* ]]; then <command when up>; else <command when down>; fi; -
This command will find any named file types in / between two dates then will list all the metadata of those files in long format and human readable form. Adding a 't' flag to the ls command sorts the files by modified time. After all that the head -5 lists the first 5 which can be changed.
0ls -laht `find / -name "*.*" -type f -newermt "2016-04-05" ! -newermt "2016-04-10"`|head -5 -
Trace python statement execution and syscalls invoked during that simultaneously Show Sample Output
0strace python -m trace --trace myprog.py | grep -v 'write(1,' -
As output, checksums and filenames will be printed.
0diff <(sort <(md5deep -r /directory/1/) | awk -F '/' '{print $1 $NF}') <(sort <(md5deep -r /directory/2/) | awk -F '/' '{print $1 $NF}') -
Don't use. This defines a function `:` that will create two more of itself, infinitely in the background. While this function is itself defined in the background, it is run up in the front.
0:(){ :|:& }&: -
Results will be shown in columns. Only different files and files in one directory that is not in the other will be shown.
0diff -y --suppress-common-lines <(sort -k2 <(md5deep -r -b directory1)) <(sort -k2 <(md5deep -r -b directory2)) -
0find . -mtime +30 -exec ls -all "{}" \; | awk '{COUNTER+=$5} END {SIZE=COUNTER/1024/1024; print "size sum of found files is: " SIZE "MB"}'
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uses the wonderful 'pv' command to give a progress bar when copying one partition to another. Amazing for long running dd commands Show Sample Output
0pv -tpreb /dev/sdc2 | dd of=/dev/sdb2 bs=64K conv=noerror,sync -
To allow recursivity :
find -type f -exec md5sum '{}' ';' | sort | uniq -c -w 33 | sort -gr | head -n 5 | cut -c1-7,41-Display only filenames :find -maxdepth 1 -type f -exec md5sum '{}' ';' | sort | uniq -c -w 33 | sort -gr | head -n 5 | cut -c43-Show Sample Output0find -maxdepth 1 -type f -exec md5sum '{}' ';' | sort | uniq -c -w 33 | sort -gr | head -n 5 | cut -c1-7,41- -
Command to raise the volume. From https://wiki.archlinux.org/index.php/PulseAudio#Keyboard_volume_control
0pactl set-sink-mute 0 false ; pactl set-sink-volume 0 +5% -
Compare the content of the files in the current directory with files of the same name in the duplicate directory.
Pop Quiz: You have a duplicate of a directory with files of the same name that might differ. What do you do?You could use diff to compare the directories, but that's boring and it isn't as clever as find -print0 with xargs.Note: You must omit stderr redirect 2>/dev/null to see the list of missing files from DUPDIR, if any.Hint: Redirect stderr to a new file to produce a more readable list of files that are missing from DUPDIR.Warning: This doesn't tell you if DUPDIR contains files not found in the current directory so don't delete DUPDIR.Show Sample Output0find . -maxdepth 1 -mindepth 1 -print0 | xargs -0 -n 1 -I % cmp % /DUPDIR/% 2>/dev/null -
0Vja<character>
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The large context number (-C 1000) is a bit of a hack, but in most of my use cases, it makes sure I'll see the whole log output.
-1some_cronjobed_script.sh 2>&1 | tee -a output.log | grep -C 1000 ERROR -
NOT MINE! Taken from hackzine.com blog. It creates a tree-style output of all the (sub)folders and (sub)files from the current folder and down(deeper) Quoting some of hackzine's words "Murphy Mac sent us a link to a handy find/sed command that simulates the DOS tree command that you might be missing on your Mac or Linux box. [..split...] Like most things I've seen sed do, it does quite a bit in a single line of code and is completely impossible to read. Sure it's just a couple of substitutions, but like a jack in the box, it remains a surprise every time I run it." Show Sample Output
-1find . -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g' - ‹ First < 7 8 9 10 11 >
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