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Full Discussion: Strange sed behaviour
Top Forums UNIX for Advanced & Expert Users Strange sed behaviour Post 302165441 by vino on Thursday 7th of February 2008 10:57:28 PM
Old 02-07-2008
Quote:
Originally Posted by ghostdog74
my guess:
\| is used in sed (gnu) as alternation. therefore
Code:
# echo "a.bc" | sed -e 's/\|/\\|/g'
\|a\|.\|b\|c\|

seem to say "blank" or "blank" (or null?) substitute with \|, hence the result.
if really want to search for a "|", use the open square brackets
Code:
# echo "a.bc" | sed -e 's/[|]/\\|/g'
a.bc
# echo "a|bc" | sed -e 's/[|]/\\|/g'
a\|bc

Wouldn't the alternation operator require atleast two operands ?
 

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ECHO(1) 						    BSD General Commands Manual 						   ECHO(1)

NAME
echo -- write arguments to the standard output SYNOPSIS
echo [-n] [string ...] DESCRIPTION
The echo utility writes any specified operands, separated by single blank (' ') characters and followed by a newline (' ') character, to the standard output. The following option is available: -n Do not print the trailing newline character. This may also be achieved by appending 'c' to the end of the string, as is done by iBCS2 compatible systems. Note that this option as well as the effect of 'c' are implementation-defined in IEEE Std 1003.1-2001 (``POSIX.1'') as amended by Cor. 1-2002. Applications aiming for maximum portability are strongly encouraged to use printf(1) to sup- press the newline character. Some shells may provide a builtin echo command which is similar or identical to this utility. Most notably, the builtin echo in sh(1) does not accept the -n option. Consult the builtin(1) manual page. EXIT STATUS
The echo utility exits 0 on success, and >0 if an error occurs. SEE ALSO
builtin(1), csh(1), printf(1), sh(1) STANDARDS
The echo utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'') as amended by Cor. 1-2002. BSD
April 12, 2003 BSD
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