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Bash: Grep lines that start with a tab character

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Using a regular expression to match the lines that start with a tab we wrote the following

grep -P '^\t'

The -P parameter (or –perl-regexp) directs grep to interpret the pattern as a Perl regular expression.

The ^ character directs the pattern to match the start of the line.
The \t character directs the pattern to match a tab character.

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