COLRM(1) | General Commands Manual | COLRM(1) |
colrm
— remove
columns from a file
colrm |
[start [stop]] |
The colrm
utility removes selected columns
from the lines of a file. A column is defined as a single character in a
line. Input is read from the standard input. Output is written to the
standard output.
If only the start column is specified, columns numbered less than the start column will be written. If both start and stop columns are specified, columns numbered less than the start column or greater than the stop column will be written. Column numbering starts with one, not zero.
Tab characters increment the column count to the next multiple of eight. Backspace characters decrement the column count by one.
The LANG
, LC_ALL
and LC_CTYPE
environment variables affect the
execution of colrm
as described in
environ(7).
The colrm
utility exits 0 on
success, and >0 if an error occurs.
Show columns below 3 (c) and above 5 (e):
$ echo -e "abcdefgh\n12345678" | colrm 3 5 abfgh 12678
Specifying a start column bigger than the number of columns in the file is allowed and shows all the columns:
$ echo "abcdefgh" | colrm 100 abcdefgh
Using 1 as start column will show nothing:
$ echo "abcdefgh" | colrm 1
The colrm
utility first appeared in
1BSD.
Jeff Schriebman wrote the original version
of colrm
in November 1974.
June 23, 2020 | macOS 14.6 |