Programming Forums > Script Programming > Sed and Awk

Pimp Daddy · Aug 28th, 2006, 5:51 AM

Although I've been using Linux for a while (in various forms - such as Slackware and Cygwin), I never got around to learning the likes of grep, sed and awk. That's what I've been doing over the past few days and today I noticed something with sed. I type the following:

(Toggle Plain Text)

$ sed -e '/mom/s/world/hull/g' h.txt

Naturally, it replaces 'world' with 'hull' and prints the result out on the screen. However, when I try overwriting what's in the file by doing this:

(Toggle Plain Text)

$ sed -e '/mom/s/world/hull/g' h.txt > h.txt

it just wipes the file. What do I have to do to overwrite the contents of a file?

Aug 28th, 2006, 5:51 AM	#1
Pimp Daddy Programmer Join Date: Aug 2004 Location: Wherever the beautiful women are. Posts: 30 Rep Power: 0	Just playing Although I've been using Linux for a while (in various forms - such as Slackware and Cygwin), I never got around to learning the likes of grep, sed and awk. That's what I've been doing over the past few days and today I noticed something with sed. I type the following: (Toggle Plain Text) $ sed -e '/mom/s/world/hull/g' h.txt $ sed -e '/mom/s/world/hull/g' h.txt Naturally, it replaces 'world' with 'hull' and prints the result out on the screen. However, when I try overwriting what's in the file by doing this: (Toggle Plain Text) $ sed -e '/mom/s/world/hull/g' h.txt > h.txt $ sed -e '/mom/s/world/hull/g' h.txt > h.txt it just wipes the file. What do I have to do to overwrite the contents of a file? __________________ David Morris BSc.(Hons), MBCS Qualified Computer Engineer Administrator (SEED Software)

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Programming Forums > Script Programming > Sed and Awk

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