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removing lines from file

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# 1  
Old 01-31-2011
removing lines from file
Hi
I have many files all with 1 field per line as in

12345
abcde
john.paul.net
6789101

how do I remove ceratin lines from these files.
Have tried sed but sed wrecks my head!

Many thanks in advance for any help
Last edited by rob171171; 01-31-2011 at 02:25 PM.. Reason: just noticed typo!
# 2  
Old 01-31-2011
What does "certain" mean? Line numbers? "John Smith"?

Please give an example of input and expected output.
# 3  
Old 01-31-2011
Hi Jim

Input file =

12345
qwerty
a2a3456tg
sdfgh
11111
22222
vvvvvvvvvvv
77777
23
111

Required output file =


12345
a2a3456tg
sdfgh
vvvvvvvvvvv
77777
23
111
# 4  
Old 02-01-2011
Code:
 $ ruby -ne 'print if !($_[/qwerty/] || $_[/22222/] || $_[/11111/])' file

# 5  
Old 02-01-2011
Or does he mean by line numbers?
Code:
sed '2d;5,6d' infile

# 6  
Old 02-01-2011
Quote:
Originally Posted by rob171171
Hi Jim

Input file =

12345
qwerty
a2a3456tg
sdfgh
11111
22222
vvvvvvvvvvv
77777
23
111

Required output file =


12345
a2a3456tg
sdfgh
vvvvvvvvvvv
77777
23
111

try:
Code:
sed -e '/qwerty\|11111\|22222/d'

# 7  
Old 02-01-2011
Only GNU sed knows alternation ( | )
Awk does though:
Code:
awk '!/qwerty|11111|22222/' file

and so does grep:
Code:
grep -Ev "qwerty|11111|22222" file
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