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sponge

List of commands for sponge:

- cat
sponge:tldr:6b029 sponge: Append file content to the source file.

$ cat ${filename} | sponge -a ${filename}

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- grep
sponge:tldr:fadef sponge: Remove all lines starting with # in a file.

$ grep -v '^${#}' ${filename} | sponge ${filename}

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