convert tab to unit separator using sed or tr with bash - Stack Overflow

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as title - I want to convert tabs in an input file / stdin to asciii unit separators on stdout / redirected file.

All of the following have no effect

tr 0x09 0x1f
tr '0x09' '0x1f'
sed  's#0x09#0x1f#g'
sed s#0x09#0x1f#g

have no effect

as title - I want to convert tabs in an input file / stdin to asciii unit separators on stdout / redirected file.

All of the following have no effect

tr 0x09 0x1f
tr '0x09' '0x1f'
sed  's#0x09#0x1f#g'
sed s#0x09#0x1f#g

have no effect

• bash
• sed
• tr

Share Improve this question Follow asked yesterday njamescouknjamescouk 17711 silver badge1313 bronze badges 1

• With GNU sed: sed 's#\x09#\x1f#g' – Cyrus Commented yesterday

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2 Answers 2

Sorted by: Reset to default 2

Neither tr nor sed understand 0x09 and 0x1f. In bash, you can use the $'...' quotes with C-style backslash escape sequences. This style understands both \t and \x... notations.

printf 'a\tb\n' | sed $'s/\t/\x1f/g'
printf 'a\tb\n' | tr '\t' $'\x1f'

With GNU tr:

tr '\t' '\37'

\t: horizontal tab

\37: unit separator (octal 37, hex 1f)

See: man tr

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