SED is a very powerful utility which allows find and replace/insert text functionality. It should be used with Caution and is recommended to use dry-run before committing the changes. Below are the various commands for text manipulation.

Note: \n = for newline and \t = for TAB space and For dry run just remove "-i" from the command

 Find the pattern and Insert text AFTER

# sed -i 's/.*search 1st Line.*/&\nInsert 2nd line/' file1

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Its possible to use awk in Alias command. I did that by simply just modifying some parenthesis and there you go, had a working awk command.

All that it required was closing awk in double quotes as opposed to single quotes and forward slash before the "$" variable. This alias command is for printing the default Gateway for an interface.

 alias eth0-gw='route -n | grep eth0 | awk "NR==1{ print \$2 }"'
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