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How to remove a specific line in a file

From: Eka1618
Subject: How to remove a specific line in a file
Date: Mon, 30 Apr 2007 12:00:30 -0700 (PDT)

I am currently trying to figure out how to remove a specific line in a file.
So far I've only been able to come up with Ideas such as removing blank
lines, duplicate lines, or a number of line that are one right after
another. I think that I should be using the commands grep, cat, and rm along
with pipes to somhow make this work. 

Here is some code that I've started so far:

first script i though of:


mtmp='wc -l mylock | awk '{print $1}''
ntmp='expr $mtmp - 1'

tail -n $netmp mylock

second idea:

cat mylock | grep 'pid' | rm -r

I am new to the BASH language, and so If there are any good websites that I
can reference please let me know!

Thank You!

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