New answers tagged printf
1
vote
Inserting text with formatting at the start of a file with printf
What I would do, using sponge from moreutils:
{
printf 'Anything\tyou\twant\tto\tadd'
cat file
} | sponge file
or in a one-liner:
{ printf 'Anything\tyou\twant\tto\tadd'; cat file; } | sponge
...
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