Format Numbers to be Comma Separated

I have a number 1234567890, and I want to insert a comma at the gap of three digits like this:1,234,567,890

If this is the problem running in your head then the following one liner will be helpful to you.

$ echo "1234567890" | sed -e ':a' -e 's/\(.*[0-9]\)\([0-9]\{3\}\)/\1,\2/;ta'
1,234,567,890

Utilize Grep Sed and Awk

In this post I will list commands that I use and include at least one of grep,sed or awk.

• cat filename | grep "phrase"
  Search line containing phrase in file
• cat filename | grep -v "phrase"
  Search line not containing phrase in file
• cat filename | grep "phrase1\|phrase2"
  Search lines containing phrase1 or phrase2 in file.
• sed -i "s/phrase1/phrase2/g" ./filename
  Replace phrase1 with phrase2 in file.
• sed -i "s/[ ]*\(.*\)[ ]*/\1/g" ./filename
  Trim spaces of each line of the file.
• awk '{if($7=="2") $7="5"; print;}' file
  Conditional modification. Field no.7 is is replaced by "5" if it is "2". The default field seperator is .
• uptime | awk 'BEGIN {FS=" "} { gsub(",",""); if (index($0,"day")) {gsub(":"," hours, ",$5);print $3" "$4", "$5" minutes"} else {gsub(":"," hours, ",$3); print $3" minutes"}}'
  Get the Uptime in a proper and clear format.
• ls | grep -v 'file or folder or regex' | xargs -I{} mv {} /target/folder/
  Move all but one to /target/folder. You can also use it to move all the files/directories in current directory to another directory in the same path.Be Aware: The Target directory should exist. Just to be at the safe side, I suggest not to miss the slash (/) at the end. This will give you warning/error if you messed up something.
  

For now I have just listed few that came in my mind; just thought to prepare a seed.
I'll promise to grow this list as soon as they come to my mind.

Note: If you have some commands in your mind, that you regularly use, plz post it as comment.