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Full Discussion: Confusing sed error message
Top Forums Shell Programming and Scripting Confusing sed error message Post 303027455 by Ralph on Sunday 16th of December 2018 06:57:02 AM
Old 12-16-2018
Confusing sed error message
This situation is extracted from a larger context. My intention for now is to escape the forward slashes in the path of a filename. (Ultimately the LINEs will come from a file.)
Code:
while read LINE ; do
        sed 's/\//\\\//g' <<< "$LINE"    # ok
        escaped=`sed 's/\//\\\//g' <<< "$LINE"`   # error message
        echo $escaped
done <<here
==: dir1/dir2/file1 dir3/dir4/file2
==: dir5/dir6/file3 dir1/file4
==: dir3/file5 dir3/file6
==: dir1/file4 dir5/dir6/file3
==: dir3/dir4/file2 dir1/dir2/file1
==: dir3/file6 dir3/file5
here

While the direct sed output looks the way I want the next line where I try to assign that to a variable gives me an error message:
Code:
==: dir1\/dir2\/file1 dir3\/dir4\/file2
sed: -e expression #1, char 9: unknown option to `s'

What's the problem?

--- Post updated at 11:57 AM ---

Well... when I use $() instead of the `` it works as it should:
Code:
while read LINE ; do
        sed 's/\//\\\//g' <<< "$LINE"
#        escaped=`sed 's/\//\\\//g' <<< "$LINE"`   # doesn't work
        escaped=$(sed 's/\//\\\//g' <<< "$LINE")   # works
        echo $escaped \<-\$escaped
done <<here
==: dir1/dir2/file1 dir3/dir4/file2
==: dir5/dir6/file3 dir1/file4
==: dir3/file5 dir3/file6
==: dir1/file4 dir5/dir6/file3
==: dir3/dir4/file2 dir1/dir2/file1
==: dir3/file6 dir3/file5
here

Output:
Code:
==: dir1\/dir2\/file1 dir3\/dir4\/file2
==: dir1\/dir2\/file1 dir3\/dir4\/file2 <-$escaped
==: dir5\/dir6\/file3 dir1\/file4
==: dir5\/dir6\/file3 dir1\/file4 <-$escaped
etc.

But what's the difference between the two? The Bash Reference doesn't mention any.
Last edited by Ralph; 12-16-2018 at 05:42 AM..
 

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LEARN ABOUT DEBIAN

diff2patches

diff2patches(1) 														   diff2patches(1)

NAME

       diff2patches - Extract non-debian/ patches from .diff.gz files

SYNTAX

       diff2patches filename
       diff2patches --help|--version

DESCRIPTION

       Extracts  patches  from	.diff.gz  which  apply to files outside the "debian/" directory scope.	A patch is created for each modified file.
       Each patch is named according to the path of the modified file, with "/" replaced by "___", and an extension of ".patch".

OPTIONS

       filename
	   Extract patches from filename which apply outside the "debian/" directory.

       --help
	   Output help information and exit.

       --version
	   Output version information and exit.

FILES

       debian/control
	      Existence of this file is tested before any patch is extracted.

       debian/
       debian/patches/
	      Patches are extracted to one of these directories.  "debian/patches/" is preferred, if it exists.  If DEB_PATCHES is present in  the
	      environment, it will override this behavior (see "ENVIRONMENT VARIABLES" section below).

ENVIRONMENT VARIABLES

       DEB_PATCHES
	      When  defined  and  points  to  an  existing  directory,	patches  are  extracted  in  that  directory  and  not under "debian/" nor
	      "debian/patches/".

SEE ALSO

       combinediff(1)

AUTHOR

       Raphael Geissert <atomo64@gmail.com>

Raphael Geissert <;atomo64@gmail.com>												   diff2patches(1)
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