Very Computer

by **James Willia** » Sun, 04 Feb 2001 03:19:04

sed 's:/product/815/:/product/816/:g' crontab.bak

I need to change all records in a directory using something similar
to the above. In the above example STDOUT shows the changes. How can
up update crontab.bak inplace in the above example?

by **John Doher** » Sun, 04 Feb 2001 03:27:36

| sed 's:/product/815/:/product/816/:g' crontab.bak
|
|
| I need to change all records in a directory using something similar
| to the above. In the above example STDOUT shows the changes. How can
| up update crontab.bak inplace in the above example?

Use a temp file, e.g.:

sed 's:/product/815/:/product/816/:g' crontab.bak > foo && mv foo crontab.bak

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by **Brendon Caligar** » Sun, 04 Feb 2001 03:57:20

Quote:> sed 's:/product/815/:/product/816/:g' crontab.bak

> I need to change all records in a directory using something similar
> to the above. In the above example STDOUT shows the changes. How can
> up update crontab.bak inplace in the above example?

as such you can't.

use ed, perl, or wrap sed into a shell script that uses some
intermediate file.
eg
perl -pi -e 's/foo/bar/g' test

B

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by **Kurt J. Lanz** » Sun, 04 Feb 2001 05:04:10

> sed 's:/product/815/:/product/816/:g' crontab.bak

> I need to change all records in a directory using something similar
> to the above. In the above example STDOUT shows the changes. How can
> up update crontab.bak inplace in the above example?

You can't. Sed by itself won't update a file in place
correctly no matter how hard you try. Write a script in
which sed writes to a temporary file, then either moves
or copies it to the original.