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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

synce-pmv

PMV(1)							   http://synce.sourceforge.net/						    PMV(1)

NAME

       pmv - move (rename) files

SYNOPSIS

       pmv [- LEVEL] [-p DEVNAME] [-h] SOURCE DESTINATION

DESCRIPTION

       pmv renames or moves a file on a device connected through SynCE.

       Forward slashes ('/') on the command line are converted to backward slashes ('').

OPTIONS

       -d LEVEL
	      Set debug log level:

	      0 - No logging (default)

	      1 - Errors only

	      2 - Errors and warnings

	      3 - Everything

       -p DEVNAME
	      Use the device with the given name, instead of the default.

       -h     Display help message.

       SOURCE Full path to the current filename.

       DESTINATION
	      Full path to the new filename.

AUTHOR

       This manual page was written by David Eriksson <twogood@users.sourceforge.net>.

SEE ALSO

       synce(1) pcp(1) pls(1) prm(1) pmkdir(1) prmdir(1)

The SynCE project						   November 2002							    PMV(1)
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