Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Issue using empty variable in grep command
Top Forums Shell Programming and Scripting Issue using empty variable in grep command Post 302956429 by jim mcnamara on Tuesday 29th of September 2015 09:31:30 PM
Old 09-29-2015
Your first line of code seems to boil down to:
Code:
DSK=$( awk '/disk/ {print substr($1, 7)' /tmp/list.out )

So that seems okay to me. You can have awk call exit 1 if it does not find something:
Code:
DSK=$( awk '/disk/ {print substr($1, 7); exit 0 } END{exit 1 }' /tmp/list.out  || echo 'bad DSK')

Then you know not to go on.

I cannot fathom what you are doing with the rest of the code-
it looks like you are trying to remove something from the output of lspv
derived from /tmp/list.out like maybe a volume group or a pvid.

And what do you want to do with the "blank" if statement? By that I mean what do you expect to find that will tell you DSK is empty? Or the result is bad.

You have to have a way to signal failure for the code to tell you it failed.
with the above first line:
Code:
[ "$DSK" = "bad DSK" ] && echo failure ||
for i in `lspv | awk '{print$1}' |grep -v "$DSK"`
 do
  echo $DSK
  if ????
  then
        echo "Fail"
        break
  else
        echo "Pass"
  fi
 done
fi

What is the i variable supposed to do here, BTW?
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Variable for -name causing issue in Find command

Hi there, I'm trying to find files that are greater then 30 days old, zip them and move to a different directory. I'm encountering an issue passing a variable (FilesToFind) to name within the find command. Here's the code I'm running: #! /usr/bin/sh FileDir=/home/ariba... (2 Replies)
Discussion started by: ParNone
2 Replies

2. Shell Programming and Scripting

issue with grep command

i am using 'psu' to grep the status of a process like below :- psu|grep -i agentf 29559 29552 0 00:53:05 ? 0:57 gn1avm_agent -n AGENTF1 28946 1 0 00:51:31 ? 0:31 gnavm_ewd -b gn1avm_agent -n AGENTF1 -c -n AGENTF1 29552 28946 0 00:53:05 ? 0:00 /bin/ksh... (6 Replies)
Discussion started by: deepakiniimt
6 Replies

3. Shell Programming and Scripting

Issue with passing variable to Grep in a shell script

Hi, I'm trying to check if methods specified in a class have been added to the corrosponding interface. My code below is giving me the following errors: grep: function: No such file or directory grep: import($zipfile): No such file or directory grep: function: No such file or... (1 Reply)
Discussion started by: racshot65
1 Replies

4. Shell Programming and Scripting

command to grep the variable from file

Hi, I am looking for the following: 1. A command to 'grep' the variable from a file 2. And check whether the entered variable is empty in that file I have a file as given below: IAGLOBAL_USERID=admin I want to check with a whether the variable contains a value, say here its admin if... (2 Replies)
Discussion started by: dbashyam
2 Replies

5. HP-UX

Performance issue with 'grep' command for huge file size

I have 2 files; one file (say, details.txt) contains the details of employees and another file (say, emp.txt) has some selected employee names. I am extracting employee details from details.txt by using emp.txt and the corresponding code is: while read line do emp_name=`echo $line` grep -e... (7 Replies)
Discussion started by: arb_1984
7 Replies

6. UNIX for Dummies Questions & Answers

Grep command issue

How am I supposed to print with one Unix command the names (and only the names) of company JMT? Problems with scandinavian letters? By typing grep JMT url | egrep --only-matching ']+'I still have company name and + marks I should get rid of. I'd be very grateful of your help bacause I am new... (1 Reply)
Discussion started by: jht
1 Replies

7. Shell Programming and Scripting

CUT Command and grep issue

I am trying to grep the oracle erros evry day from the logs file. My problem is : -rw-r----- 1 tibcolm tibco 17438361 Apr 5 11:59 RetryService-RetryService.log -rw-r----- 1 tibcolm tibco 245303 Apr 5 12:00 ResponseService-ResponseService.log -rw-r----- 1 tibcolm tibco 2122654 Apr 5 12:00... (4 Replies)
Discussion started by: neeraj617
4 Replies

8. Shell Programming and Scripting

Issue in using variable within sed command

Hi All, I am trying to use a variable within the sed command but I am not able to get the output. When I am using the following command (without variable) its working fine: sed -n '/2011\/12\/10 18:11:11./,$p' < Log.txt > Delta_Log.txt But when I am putting the value 2011\/12\/10... (4 Replies)
Discussion started by: acoomer
4 Replies

9. Shell Programming and Scripting

Variable value substitution issue with awk command issue

Hi All, I am using the below script which has awk command, but it is not returing the expected result. can some pls help me to correct the command. The below script sample.ksh should give the result if the value of last 4 digits in the variable NM matches with the variable value DAT. The... (7 Replies)
Discussion started by: G.K.K
7 Replies

10. Shell Programming and Scripting

Issue executing grep command on Solaris

more jdbc.xml <name>Fast_ds/DataSource</name> <property> <name>user</name> <value>COL_USER</value> </property>Command 1: grep -A1 '<name>user</name>' jdbc.xml|grep -v '<name>user</name>'|sed 's/\(<value>\|<\/value>\)//g'| sed -e 's/^*//'Output: Command 2: grep... (5 Replies)
Discussion started by: mohtashims
5 Replies

LEARN ABOUT OSX

locale::codes::langvar

Locale::Codes::LangVar(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangVar(3pm)

NAME

       Locale::Codes::LangVar - standard codes for language variation identification

SYNOPSIS

	  use Locale::Codes::LangVar;

	  $lvar = code2langvar('acm');		       # $lvar gets 'Mesopotamian Arabic'
	  $code = langvar2code('Mesopotamian Arabic'); # $code gets 'acm'

	  @codes   = all_langvar_codes();
	  @names   = all_langvar_names();

DESCRIPTION

       The "Locale::Codes::LangVar" module provides access to standard codes used for identifying language variations, such as those as defined in
       the IANA language registry.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default IANA language
       registry codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language variations. A code set may be specified using either a name, or
       a constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lvar = code2langvar('en','alpha-2');
	  $lvar = code2langvar('en',LOCALE_CODE_ALPHA_2);

       The codesets currently supported are:

       alpha
	   This is the set of alphanumeric codes from the IANA language registry, such as 'arevela' for Eastern Armenian.

	   This code set is identified with the symbol "LOCALE_LANGVAR_ALPHA".

	   This is the default code set.

ROUTINES

       code2langvar ( CODE [,CODESET] )
       langvar2code ( NAME [,CODESET] )
       langvar_code2code ( CODE ,CODESET ,CODESET2 )
       all_langvar_codes ( [CODESET] )
       all_langvar_names ( [CODESET] )
       Locale::Codes::LangVar::rename_langvar  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangVar::add_langvar  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangVar::delete_langvar  ( CODE [,CODESET] )
       Locale::Codes::LangVar::add_langvar_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangVar::delete_langvar_alias  ( NAME )
       Locale::Codes::LangVar::rename_langvar_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangVar::add_langvar_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangVar::delete_langvar_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 2011-2012 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.2							    2012-10-11					       Locale::Codes::LangVar(3pm)
All times are GMT -4. The time now is 01:15 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy