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how to insert a string as a first line of the file

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# 1  
Old 12-15-2010
how to insert a string as a first line of the file
Hi
I need to update a number of existing files and insert #!/bin/ksh line a the first line of the file.
Is there any awk or sed command which would help me to do that instead of doing it manually?
Thanks a lot -A
# 2  
Old 12-15-2010
If your sed supports the -i switch, you can do:
Code:
sed -i '1i\#!/bin/ksh' infile

# 3  
Old 12-15-2010
No, -i is not supported by sed Smilie
# 4  
Old 12-15-2010
Then you can do like this:
Code:
sed -i '1i\#!/bin/ksh' infile > temp_file;mv temp_file infile

# 5  
Old 12-15-2010
Or with ed
Code:
<some "ls" command that gets the files you want> | while read FILE; do
  ed $FILE << !
1i
#!/bin/ksh
.
w
q
!
done

# 6  
Old 12-15-2010
Code:
perl -i~ -0777pe's/^/\#\!\/bin\/ksh\n/' file

# 7  
Old 12-15-2010
Thanks a lot guys! It worked
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