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Full Discussion: problem in embeded command substitution
Top Forums Shell Programming and Scripting problem in embeded command substitution Post 302222557 by wrl on Thursday 7th of August 2008 03:24:17 AM
Old 08-07-2008
problem in embeded command substitution
$ echo $(tty|sed 's#/[a-z]*/##')
pts/0
$ who | grep $(tty|sed 's#/[a-z]*/##')
grep: 0652-033 Cannot open 0551-011.
grep: 0652-033 Cannot open Standard.
grep: 0652-033 Cannot open input.
grep: 0652-033 Cannot open is.
grep: 0652-033 Cannot open not.
grep: 0652-033 Cannot open a.
grep: 0652-033 Cannot open tty..
$


does anybody know why the command substitution gots error here?
does any rule forbid the command substitution in pipeline?
thanks in advance!
 

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LEARN ABOUT HPUX

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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