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How to delete line in the same file in unix ?

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# 1  
Old 09-18-2008
How to delete line in the same file in unix ?
How to delete line in the same file in unix ?
Both commands,
/bin/echo "g/$patern/d\nwq!" | ex -s $file
(echo "g/$patern/d"; echo 'wq') | ex -s $filename
works fine if there are more than 1 line in file but if there is only one line then above delete command dosent works. Please help me !!
# 2  
Old 09-18-2008
Code:
grep -v "$pattern" "$filename" >newfile

# 3  
Old 09-18-2008
this will delete whole line where pattern is found...
Quote:
vi - filename << !
:/pattern/d
:wq
!
# 4  
Old 09-22-2008
the command is not working in my .sh script.
It gives error as syntax error at line number:'<<' unmatched..
Please help ...
# 5  
Old 09-22-2008
Code:
sed -i "/$pattern/d" file

If your sed has the -i option.
# 6  
Old 09-22-2008
Code:
perl -i -ne "print unless m/$pattern/" file

The -i option is supported in Perl since way back.
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