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Full Discussion: Add character to specific columns using sed or awk and make it a permanent change
Top Forums Shell Programming and Scripting Add character to specific columns using sed or awk and make it a permanent change Post 302958224 by Don Cragun on Tuesday 20th of October 2015 09:50:51 AM
Old 10-20-2015
You could also try ed or ex with any shell that has a syntax based on the Bourne shell (e.g., ash, bash, ksh, zsh...):
Code:
#!/bin/ksh
ed -s a.sh <<-EOF
	g/beautiful/s/^/#/
	w
	q
EOF

These utilities might use a temp file internally, but you won't need to create one on your own this way.
This User Gave Thanks to Don Cragun For This Post:
ashima jain
 

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LEARN ABOUT SUNOS

suspend

suspend(1)							   User Commands							suspend(1)

NAME

       suspend - shell built-in function to halt the current shell

SYNOPSIS

   sh
       suspend

   csh
       suspend

   ksh
       suspend

DESCRIPTION

   sh
       Stops the execution of the current shell (but not if it is the login shell).

   csh
       Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su.

   ksh
       Stops the execution of the current shell (but not if it is the login shell).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5)

SunOS 5.10							    15 Apr 1994 							suspend(1)
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