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Full Discussion: [Solved] Sed error - multiple number options to `s' command
Top Forums Shell Programming and Scripting [Solved] Sed error - multiple number options to `s' command Post 302735455 by bakunin on Sunday 25th of November 2012 07:00:37 AM
Old 11-25-2012
Quote:
Originally Posted by Chandru_Raj
Code:
sed -i s/"$var2"/"$var3"/ < file1

There are several things wrong (or potentially wrong) with this line:

1. Do not use "sed -i"
You shouldn't use "sed -i" for reasons stated here. Further, if you insist on using the "-i" switch of GNU sed you have to provide a file to be changed. Using "sed < file" means sed receives data via <stdin>, not from a file. sed is simply unable to change its <stdin> and even if it could - you wouldn't notice any effect. The line would have to read:

Code:
sed -i <sed-expr> file


2. Use extensive quoting
The way you intermix fixed and variable parts on the commandline you are not guaranteed to end with a single string as argument to "sed". Always enclose sed-programs in single quotes! To do what you want to do you should enclose your variables in double quotes this way:

Code:
sed '<sed-expr>'"$var1"'<rest-of-expression>' file

Applying all this to your line it should look like this (line two preserves the inode information - if you don't need that replace it by a simple "mv"):

Code:
sed 's/'"$var2"'/'"$var3"'/' file1 > outfile
cat outfile > file1 ; rm outfile

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
elixir_sinari
 

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LEARN ABOUT LINUX

xzdiff

XZDIFF(1)							     XZ Utils								 XZDIFF(1)

NAME

       xzcmp, xzdiff, lzcmp, lzdiff - compare compressed files

SYNOPSIS

       xzcmp [cmp_options] file1 [file2]
       xzdiff [diff_options] file1 [file2]
       lzcmp [cmp_options] file1 [file2]
       lzdiff [diff_options] file1 [file2]

DESCRIPTION

       xzcmp  and xzdiff invoke cmp(1) or diff(1) on files compressed with xz(1), lzma(1), gzip(1), or bzip2(1).  All options specified are passed
       directly to cmp(1) or diff(1).  If only one file is specified, then the files compared are file1 (which must have a suffix of  a  supported
       compression format) and file1 from which the compression format suffix has been stripped.  If two files are specified, then they are uncom-
       pressed if necessary and fed to cmp(1) or diff(1).  The exit status from cmp(1) or diff(1) is preserved.

       The names lzcmp and lzdiff are provided for backward compatibility with LZMA Utils.

SEE ALSO

       cmp(1), diff(1), xz(1), gzip(1), bzip2(1), zdiff(1)

BUGS

       Messages from the cmp(1) or diff(1) programs refer to temporary filenames instead of those specified.

Tukaani 							    2010-09-27								 XZDIFF(1)
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