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Comment a block in shell

Posted 08-31-2011 at 01:22 AM by hi2arun
Tags bash, script

We all know, to comment out a line in shell script, '#' token is inserted in the line that needs to be made dead.
Eg:

Code:
# This is a dead line
echo "This line is live"
However, '#' token can be pesky if a block of lines need to be commented out.
Say, to comment out the following block using '#'

Code:
# comment starts here
# All these lines
# are blocked
# using '#' token
# ...
# ...
# ...
# ...
# comment ends here
Well.. this could be annoying if by mistake, some '#' tokens are deleted... mm .. interpreter errors while running.. ah!

Using 'block comment' option is a lot simpler and handy that gives the freedom to add/comment out any number of lines... it is simple to do.
Here you go...

Code:
<<COMMENT
All these lines
are blocked
using '#' token
...
...
...
...
COMMENT
As shown, start of comment is marked by "<<" and a label. In the given example, it is "<<COMMENT" and the same label is used to mark end of comment.
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