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Shell Programming and Scripting

Append string at start of line

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# 1  
Old 04-04-2011
Append string at start of line
Hi,
I want to append # at the start of line wherever keyword xyz is found through stream editor? Is it possible?
# 2  
Old 04-04-2011
Code:
sed '/xyz/s/^/#/' myFile

# 3  
Old 04-04-2011
Thanks Vgersh...but i am not getting the switch to append the string in the file itself instead of redirecting the output...I am on AIX V5.3...On Linux, -i helped me achieve that.
# 4  
Old 04-04-2011
Code:
printf '1,$s/xyz/s/^/#/\nwq!\n' | ex -s myFile

# 5  
Old 04-04-2011
It throws me an error saying :
Extra characters at end of "substitute" command.

Can you also help me understand it, I am just not an expert in shell scripting Smilie
And thank you for your prompt response :-)
# 6  
Old 04-04-2011
Sorry...
Code:
printf '/xyz/s/^/#/\nwq!\n' | ex -s myFile

# 7  
Old 04-04-2011
Still does not help Smilie
It get executed without any error but no change in the actual file
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