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Full Discussion: Ksh: run commands from pipe
Top Forums Shell Programming and Scripting Ksh: run commands from pipe Post 302921118 by Cochise on Wednesday 15th of October 2014 03:52:05 AM
Old 10-15-2014
For better understanding of my problem, here is the long story:

I have a large log file, that has some lines like this:
Code:
skipping: /usr/bin/chuser "gecos=ipsec;MDE0M819;;F" ipsec (TESTMODE)
skipping: /usr/bin/chuser "gecos=nobody;MDE0M819;;F" nobody (TESTMODE)
skipping: /usr/bin/chuser "gecos=perfmgr;MDE0M819;;F" perfmgr (TESTMODE)

The lines may occur multiple times.

I want to find these lines, remove duplicates, strip off "skipping:" and "(TESTMODE)" and then execute the remainining chuser command.

What I have built is this:
Code:
grep 'chuser "gecos=' modify.LOG|sort|uniq|sed 's/skipping: //; s/ (TESTMODE)//'|ksh

This works and is what I asked for.

New question: I would like to have the command string displayed on the terminal before it is send to ksh for execution.
Is there a smarter and shorter way than doing it in a do loop like below?

Code:
grep 'chuser "gecos=' modify.LOG|sort|uniq|sed 's/skipping: //; s/ (TESTMODE)//'|while read line;do print - $line;ksh "$line";done

 

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LEARN ABOUT OPENSOLARIS

fgrep

fgrep(1)							   User Commands							  fgrep(1)

NAME

       fgrep - search a file for a fixed-character string

SYNOPSIS

       /usr/bin/fgrep [-bchilnsvx] -e pattern_list [file...]

       /usr/bin/fgrep [-bchilnsvx] -f file [file...]

       /usr/bin/fgrep [-bchilnsvx] pattern [file...]

       /usr/xpg4/bin/fgrep [-bchilnqsvx] -e pattern_list [-f file]
	    [file...]

       /usr/xpg4/bin/fgrep [-bchilnqsvx] [-e pattern_list] -f file
	    [file...]

       /usr/xpg4/bin/fgrep [-bchilnqsvx] pattern [file...]

DESCRIPTION

       The  fgrep (fast grep) utility searches files for a character string and prints all lines that contain that string. fgrep is different from
       grep(1) and from egrep(1) because it searches for a string, instead of searching for a pattern that matches an  expression.  fgrep  uses  a
       fast and compact algorithm.

       The characters $, *, [, ^, |, (, ), and  are interpreted literally by fgrep, that is, fgrep does not recognize full regular expressions as
       does egrep. These characters have special meaning to the shell. Therefore, to be safe, enclose the entire string within single quotes (a').

       If no files are specified, fgrep assumes standard input. Normally, each line that is found is copied to the standard output. The file  name
       is printed before each line that is found if there is more than one input file.

OPTIONS

       The following options are supported for both /usr/bin/fgrep and /usr/xpg4/bin/fgrep:

       -b		  Precedes each line by the block number on which the line was found. This can be useful in locating block numbers by con-
			  text. The first block is 0.

       -c		  Prints only a count of the lines that contain the pattern.

       -e pattern_list	  Searches for a string in pattern-list. This is useful when the string begins with a -.

       -f pattern-file	  Takes the list of patterns from pattern-file.

       -h		  Suppresses printing of files when searching multiple files.

       -i		  Ignores upper/lower case distinction during comparisons.

       -l		  Prints the names of files with matching lines once, separated by new-lines. Does not repeat the names of files when  the
			  pattern is found more than once.

       -n		  Precedes each line by its line number in the file. The first line is 1.

       -s		  Works silently, that is, displays nothing except error messages. This is useful for checking the error status.

       -v		  Prints all lines except those that contain the pattern.

       -x		  Prints only lines that are matched entirely.

   /usr/xpg4/bin/fgrep
       The following options are supported for /usr/xpg4/bin/fgrep only:

       -q    Quiet.  Does  not	write  anything  to  the standard output, regardless of matching lines. Exits with zero status if an input line is
	     selected.

OPERANDS

       The following operands are supported:

       file    Specifies a path name of a file to be searched for the patterns. If no file operands are specified,  the  standard  input  will	be
	       used.

   /usr/bin/fgrep
       pattern	  Specifies a pattern to be used during the search for input.

   /usr/xpg4/bin/fgrep
       pattern	  Specifies  one  or  more  patterns to be used during the search for input. This operand is treated as if it were specified as -e
		  pattern_list.

USAGE

       See largefile(5) for the description of the behavior of fgrep when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).

ENVIRONMENT VARIABLES

       See environ(5) for descriptions of the following environment variables that affect the execution of fgrep:  LC_COLLATE,	LC_CTYPE,  LC_MES-
       SAGES, and NLSPATH.

EXIT STATUS

       The following exit values are returned:

       0    If any matches are found

       1    If no matches are found

       2    For syntax errors or inaccessible files, even if matches were found.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

   /usr/bin/fgrep
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

   /usr/xpg4/bin/fgrep
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWxcu4			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ed(1), egrep(1), grep(1), sed(1), sh(1), attributes(5), environ(5), largefile(5), XPG4(5)

NOTES

       Ideally, there should be only one grep command, but there is not a single algorithm that spans a wide enough range of space-time tradeoffs.

       Lines are limited only by the size of the available virtual memory.

   /usr/xpg4/bin/fgrep
       The  /usr/xpg4/bin/fgrep  utility  is identical to /usr/xpg4/bin/grep -F (see grep(1)). Portable applications should use /usr/xpg4/bin/grep
       -F.

SunOS 5.11							    24 Mar 2006 							  fgrep(1)
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