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Strange sed behaviour

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Top Forums UNIX for Advanced & Expert Users Strange sed behaviour
# 8  
Old 02-08-2008
Performed as expected in bash
> echo a.bc | sed -e "s/\|/\\|/g"
a.bc

> uname -a
SunOS grape 5.10 Generic_125100-04 sun4u sparc SUNW,Sun-Fire-V440 Solaris
> env | grep SHELL
SHELL=/bin/bash
# 9  
Old 02-12-2008
I tried the same under AIX 5.3:

Code:
# what /usr/bin/sed
/usr/bin/sed:
        61      1.14  src/bos/usr/ccs/lib/libc/__threads_init.c, libcthrd, bos530 7/11/00 12:04:14
        24      1.38  src/bos/usr/bin/sed/sed0.c, cmdedit, bos530 8/27/03 04:21:19
        35      1.14.1.21  src/bos/usr/bin/sed/sed1.c, cmdedit, bos53D, d2005_18F0 5/5/05 03:34:10

# instfix -i | grep AIX_ML
    All filesets for 5.3.0.0_AIX_ML were found.
    Not all filesets for 5300-01_AIX_ML were found.
    All filesets for 5300-02_AIX_ML were found.
    All filesets for 5300-03_AIX_ML were found.
    All filesets for 5300-04_AIX_ML were found.

# echo a.bc | sed -e 's/\|/\\|/g'
a.bc

# echo a.bc | sed -e "s/\|/\\|/g"
a.bc

Seems like you found a GNUism of GNU-sed. I find it rather interesting, that GNU-sed does it even with the "--posix"-flag. Isn't the flag supposed to turn all extensions off?

bakunin
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