Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

What does the -z expression stand for?

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting What does the -z expression stand for?
# 1  
Old 07-23-2013
What does the -z expression stand for?
What does - z and {} means

Code:
if [ -z "${ARBORDBU}" ] ; then
        echo "ERROR: \$ARBORDBU environment variable is not set\n"

# 2  
Old 07-23-2013
Code:
$ man test
...
       -z STRING
              the length of STRING is zero
...

This User Gave Thanks to zaxxon For This Post:
rafa_fed2
# 3  
Old 07-23-2013
Quote:
Originally Posted by zaxxon
Code:
$ man test
...
       -z STRING
              the length of STRING is zero
...


Hi zaxxon

how can i store the value of this evironmental value in a vriable
echo $ARBORDBU
gives as DEV as output.
how can i store output i.e. in $ARBORDBU in a variable
# 4  
Old 07-23-2013
you can easily store the content of the variable $ARBORDBU in another variable e.g. var with the below assignment.

Code:
var=$ARBORDBU

# 5  
Old 07-23-2013
Quote:
Originally Posted by codemaniac
you can easily store the content of the variable $ARBORDBU in another variable e.g. var with the below assignment.

Code:
var=$ARBORDBU

is it valid

ARBORDBU=$ARBORDBU ; export ARBORDBU
# 6  
Old 07-23-2013
technically the assignment statement is valid, but why you would want to re-assign already defined environment variable?
# 7  
Old 07-23-2013
Quote:
Originally Posted by codemaniac
technically the assignment statement is valid, but why you would want to re-assign already defined environment variable?
I know but i am having a quite weird issue.Stuck for 16 hours nowSmilieSmilie
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. IP Networking

Network stand still

**this was posted in another forum I suspect wrong one moved here **:confused: Hello all. Let me qualify my question by saying that I am struggling with how to ask the question I am semi green but have no issue reading up if pointed in the right direction. Please be gentle! A RHEL server 6.2.... (4 Replies)
Discussion started by: rsheikh01
4 Replies

2. Shell Programming and Scripting

what does ${VARIABLE:-0} stand for?

Hi all, During reading the code, i met such expressment in a KSH script. I can not figure out what does this mean and don't know how to search it in the web. Could you please check below snippet and let me know what does this mean in a shell script: VARIABLE=1 if ; then .... (3 Replies)
Discussion started by: sleepy_11
3 Replies

3. IP Networking

What does 'AF' of AF_INET stand for ?

as title. and how is it different from PF_INET ? also, any one knows sin_family , sin_port , sin_addr ..etc ? why are they called 'sin' ? finally, htons() host to network short , htonl() host to network long , ntohs() network to host short , ntohl() network to host long. why would... (6 Replies)
Discussion started by: trapeze
6 Replies

4. Programming

How to under stand the C code

#include <stdio.h> main(t,_,a) char *a; {return!0<t?t<3?main(-79,-13,a+main(-87,1-_, main(-86, 0, a+1 )+a)):1,t<_?main(t+1, _, a ):3,main ( -94, -27+t, a )&&t == 2 ?_<13 ?main ( 2, _+1, "%s %d %d\n" ):9:16:t<0?t<-72?main(_,... (4 Replies)
Discussion started by: brain_full
4 Replies

5. Solaris

update stand-by server

hi all , we are in the process of migrating from one system to another. i have some questions/concerns and i hope that u can help me with. 1) . we are in the process of merging to seperate system together , these applications run on 2 seperate sunfires . after the merge we will have one... (0 Replies)
Discussion started by: ppass
0 Replies

6. Shell Programming and Scripting

Can under stand the script

Hi all, I am working on following script which is already working and i am trying to understand but could not can any body help me in follwoing script. I understand that it deletes record from tables. using DB2 import from /dev/null. I dont know where in second portion it loads the data in to... (0 Replies)
Discussion started by: sam71
0 Replies

7. UNIX for Dummies Questions & Answers

stand alone wants to boot off network

Hello Everybody, I have a Sun Sparc 5 that used to have Solaris 8 on it. I wanted to build my skills at installing the software and then all went wrong for me. This computer is a stand alone, not networked at all. So I got my hands on Solaris 9 Sparc version, I went through the install and at... (1 Reply)
Discussion started by: oilpainter69
1 Replies

8. UNIX for Dummies Questions & Answers

OEM - what does this abbreviation stand for?

Just saw this OEM abbreviation during installation of Solaris 8. I'm curious to know what the letters stand for and what OEM actually is. (3 Replies)
Discussion started by: Kanu77
3 Replies

9. UNIX for Dummies Questions & Answers

No stand-by, keep on

How do you or what is the setup to keep the (server) up from shutting down? It is not server yet but it might very likely become to serve few clients. But, once I get in in the morning its off. It's Sparc, Solaris 8 and I would like to keep it running over night but once it is not attended it... (2 Replies)
Discussion started by: softarch
2 Replies
Login or Register to Ask a Question