Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Bash -o -v -R operators
Top Forums UNIX for Beginners Questions & Answers Bash -o -v -R operators Post 303012693 by kristinu on Wednesday 7th of February 2018 03:56:29 PM
Old 02-07-2018
Conditional
Quote:
Originally Posted by RudiC
How about testing / checking / verifying what you learned in small steps, e.g. by running the small snippet posted? And then only proceeding to a more complex example?

For your above problem (totally different story!): elif needs an additional test and a then keyword... c.f. man bash.
I have tried the example and now need to use in an if condition. Do not understand how I need an additional test and a then keyword. How does that work out?

---------- Post updated at 02:49 PM ---------- Previous update was at 02:43 PM ----------

Quote:
Originally Posted by RudiC
How about testing / checking / verifying what you learned in small steps, e.g. by running the small snippet posted? And then only proceeding to a more complex example?

For your above problem (totally different story!): elif needs an additional test and a then keyword... c.f. man bash.
I understand now

---------- Post updated at 03:56 PM ---------- Previous update was at 02:49 PM ----------

How about -o optname? What is a shell option optname

And for -R optname, what is a name reference?
 

9 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

If with set operators

Hi guys, I'm trying to run more than one "if" condition at once. What I want is something like if ] or ] or ]; then ... I can't remember the syntax for using this or/and set operators. Can someone please assist/ jog my memory? thanks Khoom (2 Replies)
Discussion started by: Khoomfire
2 Replies

2. UNIX for Dummies Questions & Answers

Operators

I am trying to understand Does the following: {tmp+=$10} Mean take $10 and add them all up and call it tmp thanks! (2 Replies)
Discussion started by: llsmr777
2 Replies

3. Shell Programming and Scripting

And and OR Operators with If Statement.

Hi All, I have 2 variables. Result1 and Result2. I want to put a condition that if Both are True then echo "All True" Else Show Error. Right now i am doing this and getting error. if ; then echo "All True" else echo "Failed" fi; Error. line 8: ' Solution: Looking for (2 Replies)
Discussion started by: mkashif
2 Replies

4. Shell Programming and Scripting

Operators

I really don't know the meaning of these operators. Could someone explain the meanings so I can make my test for today? <, <=, ==, !=, >=, >, ||, &&, ! ~ , !~ Thanks! (1 Reply)
Discussion started by: Erjen
1 Replies

5. Homework & Coursework Questions

Operators

I really don't know the meaning of these operators. Could someone explain the meanings? <, <=, ==, !=, >=, >, ||, &&, ! ~ , !~ Thanks! (1 Reply)
Discussion started by: Erjen
1 Replies

6. Shell Programming and Scripting

Can you use logical operators in a case statement (bash)?

I'm pretty sure I already know the answer to this, but I want to make sure I'm not overlooking anything. I'm working on a log monitoring script and every 10 lines I want to display a summary of events. The thing is, there are a lot of possible events, that likely won't have happened, so I only want... (0 Replies)
Discussion started by: DeCoTwc
0 Replies

7. Shell Programming and Scripting

BASH - set specific user variable via string operators

Apologies for the utter triviality of this question, but we all have to start somewhere! I've also tried searching but this question is pretty vague so I didn't (a) really know what to search for or (b) get many relevant hits to what I did search for. Anyway, I'm in the process of self-teaching... (1 Reply)
Discussion started by: u5j84
1 Replies

8. Shell Programming and Scripting

operators in if loop

Hi all, I have a variable which is having the value like below, $ echo ${p} 8 15 22 30 $ My requirement is that the variable should return true when it contains only one number like below, $ echo ${p} 15 $ Otherwise, it should return false if it contains more than one number. I... (4 Replies)
Discussion started by: raghu.iv85
4 Replies

9. Shell Programming and Scripting

awk and Unary Operators in Bash

I am getting the following error /home/hagbard/chaos/resip/ictja/siculet-0.0.0/amvib/tmspan.sh: line 135: BEGIN {printf "%.0f", int((tm-(thh*60.0*60.0))/60.0)}: No such file or directory /home/hagbard/chaos/resip/ictja/siculet-0.0.0/amvib/tmspan.sh: line 138: The code is this ... (3 Replies)
Discussion started by: kristinu
3 Replies

LEARN ABOUT CENTOS

grub-render-label

GRUB-RENDER-LABEL(1)                                               User Commands                                              GRUB-RENDER-LABEL(1)

NAME

       grub-render-label - generate a .disk_label for Apple Macs.

SYNOPSIS

       grub-render-label [OPTION...] [OPTIONS]

DESCRIPTION

       Render Apple .disk_label.

       -b, --bgcolor=COLOR
              use COLOR for background

       -c, --color=COLOR
              use COLOR for text

       -f, --font=FILE
              use FILE as font (PF2).

       -i, --input=FILE
              read text from FILE.

       -o, --output=FILE
              set output filename. Default is STDOUT

       -t, --text=STRING
              set the label to render

       -v, --verbose
              print verbose messages.

       -?, --help
              give this help list

       --usage
              give a short usage message

       -V, --version
              print program version

       Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.

REPORTING BUGS

       Report bugs to <bug-grub@gnu.org>.

SEE ALSO

       The  full  documentation  for grub-render-label is maintained as a Texinfo manual.  If the info and grub-render-label programs are properly
       installed at your site, the command

              info grub-render-label

       should give you access to the complete manual.

grub-render-label (GRUB) 2.02-2ubuntu8.3                             July 2018                                                GRUB-RENDER-LABEL(1)
All times are GMT -4. The time now is 10:48 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy