Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Checking if file exists using a NOT operator and shell variable
Top Forums Shell Programming and Scripting Checking if file exists using a NOT operator and shell variable Post 302304090 by Gee-Money on Saturday 4th of April 2009 09:23:38 PM
Old 04-04-2009
I don't think you can set "?"

For one thing, you do assignment without the "$", so even if you tried, it would be
Code:
$ set ?=127
$ echo $?
0

However, it doesn't achieve the desired result, as after every command (even "set"), "?" is set to the exist status of last command.

You could just use an argument to exit (or return if in a function), as in

Code:
exit 127 (or return 127)

And for your file test...try the ! at the left of the test

Code:
if [ ! -e $4 ]; then
  stuff;
  exit 127;
fi

Last edited by Gee-Money; 04-04-2009 at 10:32 PM..
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Checking the file if it exists

Hi This will be useful who is looking for checking the files in a directory #chmod 777 /cronacle/tools/teradata/opo/bin/file_check.sh SUBJECT=`echo "File Not Found"` SUBJECT1=`echo "File Found"` #RECIPIENT=Madhu.Reddy@ge.com cd /cronacle/tools/teradata/opo/bin file_list=attach.sh if ... (3 Replies)
Discussion started by: ksmbabu
3 Replies

2. Shell Programming and Scripting

Checking if a file exists

How can I check if a file exists in shell script. Basically, I want to check if a file Test_msgs has been created today. If it has been then append data to it. Otherwise, create it. I have written the following but it does not work. todaysdate=$(date +%d%m%Y) timenow=$(date +%H%M%S)... (4 Replies)
Discussion started by: gugs
4 Replies

3. UNIX for Dummies Questions & Answers

File already exists error while using '>' operator

hi i am using the below code grep -v '^$' file1.lst >file1.lst but it gives file1.lst already exists. And i want to over rite on the same file Whats the work around? (5 Replies)
Discussion started by: jathin12
5 Replies

4. Shell Programming and Scripting

Checking if file exists

How can I check if a file exists in csh? I know there is "-e $file" but do not know exactly how to use it. I have tried the below but I'm getting "Bad : modifier in $ ( )." foreach f ($AfullnameLst) if (-e $f) then echo "$f: file exists" endif end (6 Replies)
Discussion started by: kristinu
6 Replies

5. Shell Programming and Scripting

what is the difference between -f and -e, when checking for file exists

Hi All, what is the difference between -f and -e. Regards, ch33ry (1 Reply)
Discussion started by: ch33ry
1 Replies

6. Shell Programming and Scripting

Checking whether the file exists under a directory and doing a diff

Hi Everyone, I am writing a shell script for the below needs and would like your suggestions and advices. I have a lot of scripting files(Shell Scripts) under the directory: /home/risk_dev/dev I have another directory which has a lot of shell scripts under the directory: ... (2 Replies)
Discussion started by: filter
2 Replies

7. Shell Programming and Scripting

Checking if file exists and unzipping

Hey, I am new to scripting and was wondering what is wrong with this if statement. I want to check if file exists and the if it does to unzip it. I program it as follows if ; then gunzip *_filename.gz fi Thanks in advance! Please use code tags next time for your code and data. (10 Replies)
Discussion started by: mostarac2487
10 Replies

8. Shell Programming and Scripting

Determine a shell variable exists in file?

Hi Folks, Trying to build up a script that will lookup a username invoked as: ./buildscript.sh <username> This should take <username> and look it up in <username_file> and prepare for further processing. Here is the snippet that isn't working just right: user=$1 if ]; then echo... (1 Reply)
Discussion started by: gdenton
1 Replies

9. Shell Programming and Scripting

Problem with ssh and checking if file exists

Hi All, I am facing a problem while checking for existence of file over ssh ! Basically, i want to ssh and check if file exists.. If file exists return 1. If file does not exits return 0 (or any value) I am using the below code file_avail=`ssh username@host "if ]; then exit 1;... (10 Replies)
Discussion started by: galaxy_rocky
10 Replies

10. Shell Programming and Scripting

For loop without checking file exists

In several scripts that process files matched by name pattern I needed to add a check for file existence. Just to illustrate let's say I need to process all N??? files: /tmp$ touch N100 N101 /tmp$ l ?10 -rw-rw-r-- 1 moss group 0 Apr 19 11:22 N100 -rw-rw-r-- 1 moss group ... (10 Replies)
Discussion started by: migurus
10 Replies

LEARN ABOUT CENTOS

locale::codes::langext

Locale::Codes::LangExt(3)				User Contributed Perl Documentation				 Locale::Codes::LangExt(3)

NAME

       Locale::Codes::LangExt - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangExt;

	  $lext = code2langext('acm');		       # $lext gets 'Mesopotamian Arabic'
	  $code = langext2code('Mesopotamian Arabic'); # $code gets 'acm'

	  @codes   = all_langext_codes();
	  @names   = all_langext_names();

DESCRIPTION

       The "Locale::Codes::LangExt" module provides access to standard codes used for identifying language extensions, 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 extensions. 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:

	  $lext = code2langext('acm','alpha');
	  $lext = code2langext('acm',LOCALE_LANGEXT_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from the IANA language registry, such as 'acm' for Mesopotamian Arabic.

	   This is the default code set.

ROUTINES

       code2langext ( CODE [,CODESET] )
       langext2code ( NAME [,CODESET] )
       langext_code2code ( CODE ,CODESET ,CODESET2 )
       all_langext_codes ( [CODESET] )
       all_langext_names ( [CODESET] )
       Locale::Codes::LangExt::rename_langext  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangExt::add_langext  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangExt::delete_langext  ( CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangExt::delete_langext_alias  ( NAME )
       Locale::Codes::LangExt::rename_langext_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::delete_langext_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) 2011-2013 Sullivan Beck

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

perl v5.16.3							    2013-02-27						 Locale::Codes::LangExt(3)
All times are GMT -4. The time now is 02:30 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy