Any way to have a "verbose mode" or "debug mode" with sed?
10,915
As fra-san mentioned, GNU sed
introduced a --debug
option which does pretty much what you’re looking for, in version 4.6; so e.g if you run:
printf '%s\n' one two | sed --debug 'H;1h;$x;$s/\n/_/g'
the output is
SED PROGRAM:
H
1 h
$ x
$ s/\n/_/g
INPUT: 'STDIN' line 1
PATTERN: one
COMMAND: H
HOLD: \none
COMMAND: 1 h
HOLD: one
COMMAND: $ x
COMMAND: $ s/\n/_/g
END-OF-CYCLE:
one
INPUT: 'STDIN' line 2
PATTERN: two
COMMAND: H
HOLD: one\ntwo
COMMAND: 1 h
COMMAND: $ x
PATTERN: one\ntwo
HOLD: two
COMMAND: $ s/\n/_/g
MATCHED REGEX REGISTERS
regex[0] = 3-4 '
'
PATTERN: one_two
END-OF-CYCLE:
one_two
I don’t know what distribution you use, but this version of sed (or a later one) is available in Debian 10, in Ubuntu 19.04, and derivatives; it will be available in Fedora 33.
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Author by
don_crissti
Updated on September 18, 2022Comments
-
don_crissti over 1 year
Is there a way to make
gnu sed
be verbose about what is run and what is done ?
I'd like to have something like a "debug mode" so that I can see - for each line of input - the content of the hold space and pattern space before and after the script is run etc.