Given a hosts list, ssh one by one and echo its name only if 'processname' is not running. Show Sample Output

Sure, it's dirty, but it's quick, it only displays the excuse, and it works. Show Sample Output

using awk, changed the line given by sucotronic in command #11733 to print the first and second columns Show Sample Output

Poor email reputation got you down? Perhaps you're unknowingly forwarding every spam email that makes it through to info@website.com to website@gmail.com. This command outputs every forwarding address set up within a Zimbra installation.

This prints out a list of all zombie processes PIDs so you can do things like kill the zombies Show Sample Output

Replace 2014-11-27 by the desired date. Remove -D for making it work.

This is useful as a git hook to print out the directories that had files changed on a commit. Each directory is its own package. Show Sample Output

Count how many times a pattern is present into a stream. It can be one or more lines. No overlapping. It means searching for aa on aaa will output 1 not 2.

Count how many times a pattern is present into a file. It can be one or more lines. No overlapping. It means searching for aa on aaa will output 1 not 2.

Show top apps that use internet, sorted by count connections and grouped by TYPE and Protocol Show Sample Output

Show what the process are opening many many file descriptos now, we can analyze this for the reason why server is worked slowly. Show Sample Output

The sample output shows each record/row with the last field zero-padded to 26 digits. For testing, I used (L)ine and field/column numbers.... Line 4, field2 = L42, etc up to the last field where I just used line numbers X 4. I had some whitespace-delimited files with variable-length records/rows (having 4 - 5 fields/columns) which required reformatting by zero-padding the last field to 26 digits. This requires setting NF (Not $NF) as an awk variable, with a simple conditional that assumes that any line where (N)umber of (F)ields does NOT equal 4 has a NF of 5. If needed, more conditional checks can be added, and the "NF" changed to any field ($1, $5, etc). Show Sample Output

from a svn repo, print a log, with diff, of each commit touching a given file

Use this command to watch apache access logs in real time to see what pages are getting hit. Show Sample Output

This is much easier to parse and do something else with (eg: automagically create ZFS vols) than anything else I've found. It also helps me keep track of which disks are which, for example, when I want to replace a disk, or image headers in different scenarios. Being able to match a disk to the kernels mapping of said drive the disks serial number is very helpful ls -l /dev/disk/by-id Normal `ls` command to list contents of /dev/disk/by-id grep -v "wwn-" Perform an inverse search - that is, only output non-matches to the pattern 'wwn-' egrep "[a-zA-Z]{3}$" A regex grep, looking for three letters and the end of a line (to filter out fluff) sed 's/\.\.\/\.\.\///' Utilize sed (stream editor) to remove all occurrences of "../../" sed -E 's/.*[0-9]{2}:[0-9]{2}\s//' Strip out all user and permission fluff. The -E option lets us use extended (modern) regex notation (larger control set) sed -E 's/->\ //' Strip out ascii arrows "-> " sort -k2 Sort the resulting information alphabetically, on column 2 (the disk letters) awk '{print $2,$1}' Swap the order of the columns so it's easier to read/utilize output from sed 's/\s/\t/' Replace the space between the two columns with a tab character, making the output more friendly For large ZFS pools, this made creating my vdevs immeasurably easy. By keeping track of which disks were in which slot (spreadsheet) via their serial numbers, I was able to then create my vols simply by copying and pasting the full output of the disk (not the letter) and pasting it into my command. Thereby allowing me to know exactly which disk, in which slot, was going into the vdev. Example command below. zpool create tank raidz2 -o ashift=12 ata-... ata-... ata-... ata-... ata-... ata-... Show Sample Output

# grab the first line showing php version php -i | grep 'PHP Version' | awk '{if(NR==1)print}' php -i | grep 'PHP Version' | sed -n '1!p' php -i | grep 'PHP Version' | tail -n 1 Show Sample Output

OSX users as well as linux users with copy/paste buffer commands can remove duplicate items from their copy buffer with this command. I use this often when I have to copy a long list of items that I didn't generate, but I need to paste elsewhere in a list that's unique. If retaining the original order of lines isn't important to you, use the following command which is easier to remember. pbpaste | sort | uniq | pbcopy

Use awk simple function to find maximum value in a list saved into file. change with column number and with your file If use grep variant compile your grep use pipe and paste this command without file name value. For finding both max and min values use: awk 'function max(x){i=0;for(val in x){if(ix[val]){i=x[val];}}return i;} /^#/{next} {a[$]=$;next} END{minimum=min(a);maximum=max(a);print "Max = "maximum" and Min_value = "minimum}'