> can do it.
echo "text" > file
tee can do it.
echo "test" | tee file
Can sed do it without using either of the above? Is it possible to save the output of a sed command to a file without using either > or tee?
Answers:
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Method 1
tee and > can be used for data redirection because these are meant to be used for data redirection in linux.
sed on the other hand is a stream editor. sed is not meant for data redirection as tee and > meant to be. However you can use conjunction of commands to do that.
use tee or > with sed
sed 's/Hello/Hi/g' file-name | tee file
or
sed 's/Hello/Hi/g' file-name > file
use sed with -i option
sed -i 's/Hello/Hi/g' file-name
the last one does not redirect, instead it will make changes in the file itself.
Method 2
sed has the w command that might do what you require:
w filename
Write the current pattern space to filename.
sed 'w file' on its own will have the same effect as tee file. If there are other sed commands, put the w last:
sed 's/This/That/;w file'
However, this won’t be affected by the -n/--quiet/--silent option. That only suppresses the content that would otherwise have gone to standard output.
Method 3
As ankidaemon correctly pointed out how we can save sed output to a file. I would like to add that if we are performing some operations on a file i.e replace and would like to save the output to the same file. There is a -i flag in sed which makes inplace edits possible. This however creates a backup file in the process if a suffix is provided as argument. If that’s not needed, that can be done by just passing empty filename or nothing to -i flag.
Example: sed -i "s/from/to/" file is inplace changing the file.
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