Sed(1) one-liners
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Sed(1) one-liners
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Re: Sed(1) one-liners
#2Re: Sed(1) one-liners
#3I don't see any use of the 'in-place' -i option.
My most useful one-liner:
sed -i "s/pat/rep/g" file
To make a backup of old file use -i.bak instead of -i where .bak would be the suffix of the backup file.
Re: Sed(1) one-liners
#4I don't see any use of the 'in-place' -i option. My most useful one-liner: sed -i "s/pat/rep/g" file It means replace in-place all matches of pat with rep in file. To make a backup of old file use -i.bak instead of -i where .bak would be the suffix of the backup file.
Option -i is not defined in POSIX sed. That's probably the reason author didn't include it in his list.
I have heard that it's GNU sed option only. (But can't currently say if it's 100% true.)
Re: Sed(1) one-liners
#5I don't see any use of the 'in-place' -i option. My most useful one-liner: sed -i "s/pat/rep/g" file It means replace in-place all matches of pat with rep in file. To make a backup of old file use -i.bak instead of -i where .bak would be the suffix of the backup file.
Option -i is not defined in POSIX sed. That's probably the reason author didn't include it in his list. I have heard that it's GNU sed option only. (But can't currently say if it's 100% true.)
There's no reason why this functionality should be in sed when it can be implemented on its own and re-used. IIRC there's an an example script to for that in _The Unix Programming Environment_. Better to use sudo than have everything implement its own sudo-like functionality, etc.
See "UNIX Style, or cat -v Considered Harmful" by Rob Pike (http://harmful.cat-v.org/cat-v/) for a longer discussion of this.
Re: Sed(1) one-liners
#6Earlier quoted context omitted.
Option -i is not defined in POSIX sed. That's probably the reason author didn't include it in his list. I have heard that it's GNU sed option only. (But can't currently say if it's 100% true.)
There's no reason why this functionality should be in sed when it can be implemented on its own and re-used. IIRC there's an an example script to for that in _The Unix Programming Environment_. Better to use sudo than have everything implement its own sudo-like functionality, etc. See "UNIX Style, or cat -v Considered Harmful" by Rob Pike ( http://harmful.cat-v.org/cat-v/ ) for a longer discussion of this.
In place operations have been implemented as a standalone utility: sponge from moreutils.
sed 's/blah/foo/' file | sponge fileRe: Sed(1) one-liners
#7I don't see any use of the 'in-place' -i option. My most useful one-liner: sed -i "s/pat/rep/g" file It means replace in-place all matches of pat with rep in file. To make a backup of old file use -i.bak instead of -i where .bak would be the suffix of the backup file.
Option -i is not defined in POSIX sed. That's probably the reason author didn't include it in his list. I have heard that it's GNU sed option only. (But can't currently say if it's 100% true.)
Yes, thank you. Forgot to qualify that -i is only in GNU sed.
But I think it is in GNU sed for a reason -- it is a practical shortcut. The only thing I use sed for is to do search and replaces. If the command spanned 2 lines or had pipes and redirects a lot of people just wouldn't remember it.
Re: Sed(1) one-liners
#8I don't see any use of the 'in-place' -i option. My most useful one-liner: sed -i "s/pat/rep/g" file It means replace in-place all matches of pat with rep in file. To make a backup of old file use -i.bak instead of -i where .bak would be the suffix of the backup file.
Equivalent perl one-liner (Perl regex may be more convenient):
perl -e 's/pat/rep/g' -p -i file
Re: Sed(1) one-liners
#9Earlier quoted context omitted.
Option -i is not defined in POSIX sed. That's probably the reason author didn't include it in his list. I have heard that it's GNU sed option only. (But can't currently say if it's 100% true.)
There's no reason why this functionality should be in sed when it can be implemented on its own and re-used. IIRC there's an an example script to for that in _The Unix Programming Environment_. Better to use sudo than have everything implement its own sudo-like functionality, etc. See "UNIX Style, or cat -v Considered Harmful" by Rob Pike ( http://harmful.cat-v.org/cat-v/ ) for a longer discussion of this.
I checked - it's pgs. 152-156. They call their utility "overwrite".
"...Many other commands could also use a -o command. For example, sed could edit a file in place: ... It would be impractical to modify all such commands to add the option. Furthermore, it would be bad design: it is better to centralize functions, as the shell does with the > operator."
Re: Sed(1) one-liners
#10Earlier quoted context omitted.
Option -i is not defined in POSIX sed. That's probably the reason author didn't include it in his list. I have heard that it's GNU sed option only. (But can't currently say if it's 100% true.)
Yes, thank you. Forgot to qualify that -i is only in GNU sed. But I think it is in GNU sed for a reason -- it is a practical shortcut. The only thing I use sed for is to do search and replaces. If the command spanned 2 lines or had pipes and redirects a lot of people just wouldn't remember it.
I agree. It's very practical.