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Shell Programming and Scripting

Leaving last 30 lines

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Top Forums Shell Programming and Scripting Leaving last 30 lines
# 8  
Old 01-10-2013
Code:
tail -r temp | nawk 'NR>30'|tail -r

This is three commands, nearly a script Smilie
# 9  
Old 01-10-2013
But jotne we can execute it in one go
correct..
Code:
tail -r temp | nawk 'NR>30'|tail -r

But I didnt try yet is it working or not. I am not sure what
Code:
tail -r

does
# 10  
Old 01-10-2013
try also:
Code:
tail -30 file

# 11  
Old 01-10-2013
If you don't know what tail -r does, or any other command, read the manual page for it.

Code:
man tail

Quote:
Originally Posted by rdrtx1
try also:
Code:
tail -30 file

That will display the lines the user doesn't want.
# 12  
Old 01-10-2013
scott and rdrtx1, I want to leave last 30 line, so
Code:
tail -30 filename

is not helpful
# 13  
Old 01-10-2013
try also:
Code:
tail -30 filename > f.tmp
mv f.tmp filename

# 14  
Old 01-10-2013
Code:
sed -n "1,$(( `wc -l < filename` - 30 ))p" filename
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