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pattern matching

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# 1  
Old 12-30-2008
pattern matching
hi ,

i am trying to search for a pattern in the file and then replace the pattern.

please guide me

Thanks,
Mahi
# 2  
Old 12-30-2008
man grep
man sed
# 3  
Old 12-30-2008
pattern matching
hi pludi,

i tried with sed cmd

sed 's/ABC/abc/g' $file1

but i can see the change only on cmd prompt but the in the file ABC is not replaced with abc.
# 4  
Old 12-30-2008
u need to redirect it to anoter file, u cannot directly make changes in original file. U can use replace command in VI editor if you want...

Ex: sed s/ABC/abc/g $file >$file_tmp

U can use replace command in VI editor if you want...

syntax: :%s/ABC/abc/g (in vi editor)
# 5  
Old 12-30-2008
sed tries to be non-destructive, so it will keep your input untouched and print any changes to STDOUT. If you want to change a file inplace, try
Code:
cp ${file1} ${file1}.orig
sed -e 's/ABC/abc/g' ${file1}.orig > ${file1}
rm ${file1}.orig

# 6  
Old 12-30-2008
thanks for the help ..
but i have a small problem here
actually i need to create a new file with a name similar to the old file.

i.e. if the old file is abc.txt , the new file should be abc_1.txt
i should get the substring of the file name and then name the new one
please let me know how to do it

Thanks in Advance
# 7  
Old 12-30-2008
So you don't want to change the content of the file, but the filename. I can give you 2 options for that:
  1. If all files have the same extension use basename ${file} <ext> (e.g. basename ${file} '.txt'), which will give you the filename without the extension
  2. If they use different extensions use echo ${file} | sed -e 's/\(.*\)\.\(.*$\)/\1_1.\2/', which will append '_1' to the filename
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