Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: BASH - set specific user variable via string operators
Top Forums Shell Programming and Scripting BASH - set specific user variable via string operators Post 302456615 by frans on Friday 24th of September 2010 05:31:35 PM
Old 09-24-2010
With only 1 option, there's no need of getopts (which is a powerful feature of bash), so you can proceed this way:
bash code:
  1. if [ "$1" = "-h" ]
  2. then
  3.    header=$2
  4.    shift 2 # puts the 3d param in $1 and the 4th in $2
  5. fi
  6. file=${[B]1[/B]:?"input file not specified"}
  7. echo -e -n ${header:+"albums artist\n"}
  8. sort -nr $file | head -${2:=10}
I simplified it a bit, avoiding intermediate variable names.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

[bash] Check if variable is set or blank

Hello guys. In my script, i have the following code: echo "The tarfile contains these directorys" tar -tf file.tar > tarlist.txt cat tarlist | awk -F/ '{print $1 "/" $2}' | nl echo "Enter path of the directory you want to extract or just press enter to extract everything: " read path... (1 Reply)
Discussion started by: noratx
1 Replies

2. 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

3. Shell Programming and Scripting

Set specific part in command output into variable

I am trying unsuccessfully to set into a variable a specific part of command output: The command output will be as: line 1: <varied> line 2: 2 options: option 1: Set view: ** NONE ** or option 2: Set view: <different_name_of_views_always_without_spaces> and I would like to get into... (7 Replies)
Discussion started by: orit
7 Replies

4. UNIX for Dummies Questions & Answers

set sub-string as variable

Hi all, i really new in linux and just heard about shell scripting couple days ago.. i did exercises on linux in online tutorial but as a beginner, i'm facing problems in developing the script as there are errors that sometimes i dun have any idea on how to solve it.What i'm doing now is not... (3 Replies)
Discussion started by: tedy2808
3 Replies

5. Shell Programming and Scripting

Howto set string variable in TCL?

Anyone knows how to set variable in TCL ? let say i have a password variable and it will have different values. set variable and variable has different values like: xxxx yyyy zzzz (0 Replies)
Discussion started by: linuxgeek
0 Replies

6. Shell Programming and Scripting

bash variable (set via awk+sed) not working as expected

Hi! Been working on a script and I've been having a problem. I've finally narrowed it down to this variable I'm setting: servername=$(awk -v FS=\/ '{ print $7 } blah.txt | sed 's\/./-/g' | awk -v FS=\- '{print $1}')" This will essentially pare down a line like this: ... (7 Replies)
Discussion started by: creativedynamo
7 Replies

7. Shell Programming and Scripting

Bash - get specific character from the string

Hi! If I want to extract a character from a specific position of a string, I can use ${string:1:1} (if I want character at the position 1). How can I do the same thing, when the number of position is contained in the variable? ${string:$var:1}doesn't work, unfortunately. Thanks in advance. (2 Replies)
Discussion started by: xqwzts
2 Replies

8. Shell Programming and Scripting

Bash script set command to a variable

Hi, Will following set up work in bash script? I've got errors if assigning following binary command to a variable. But on the other hand, COMMAND="ls" works. Any explanation please? How can I assign binary command to a variable COMMAND then I can just call ${COMMAND}? COMMAND="rsync"... (3 Replies)
Discussion started by: hce
3 Replies

9. Shell Programming and Scripting

If a string variable value exists in a set of values

Can some one please help me with the syntax in shell script for the below : if $var1 exists in ('val1','val2','val3') I want to execute a set of commands if the value of var1 variable matches any one of the given string values. Please let me know if there are any other option to go by. ... (10 Replies)
Discussion started by: Pandee
10 Replies

10. Shell Programming and Scripting

Bash question: working with an array of previously set variable strings

while i've used arrays to work with variables, i've never used them to loop through a set of strings and wanted to ask the community for some feedback or assistance. let me be specific. here's my code: # URL port Variables port2195=`nc -z $url2195 2195` port2196=`nc -z $url2196 2196`... (5 Replies)
Discussion started by: hungryd
5 Replies

LEARN ABOUT SUSE

quiz

QUIZ(6) 							 BSD Games Manual							   QUIZ(6)

NAME

     quiz -- random knowledge tests

SYNOPSIS

     quiz [-t] [-i file] [question answer]

DESCRIPTION

     The quiz utility tests your knowledge of random facts.  It has a database of subjects from which you can choose.  With no arguments, quiz
     displays the list of available subjects.

     The options are as follows:

     -t      Use tutorial mode, in which questions are repeated later if you didn't get them right the first time, and new questions are presented
	     less frequently to help you learn the older ones.

     -i      Specify an alternative index file.

     Subjects are divided into categories.  You can pick any two categories from the same subject.  quiz will ask questions from the first cate-
     gory and it expects answers from the second category.  For example, the command ``quiz victim killer'' asks questions which are the names of
     victims, and expects you to answer with the cause of their untimely demise, whereas the command ``quiz killer victim'' works the other way
     around.

     If you get the answer wrong, quiz lets you try again.  To see the right answer, enter a blank line.

   Index and Data File Syntax
     The index and data files have a similar syntax.  Lines in them consist of several categories separated by colons.	The categories are regular
     expressions formed using the following meta-characters:

	   pat|pat  alternative patterns
	   {pat}    optional pattern
	   [pat]    delimiters, as in pat[pat|pat]pat

     In an index file, each line represents a subject.	The first category in each subject is the pathname of the data file for the subject.  The
     remaining categories are regular expressions for the titles of each category in the subject.

     In data files, each line represents a question/answer set.  Each category is the information for the question/answer for that category.

     The backslash character (``'') is used to quote syntactically significant characters, or at the end of a line to signify that a continuation
     line follows.

     If either a question or its answer is empty, quiz will refrain from asking it.

FILES

     /usr/share/games/quiz  The default index and data files.

BUGS

     quiz is pretty cynical about certain subjects.

BSD
								   May 31, 1993 							       BSD
All times are GMT -4. The time now is 12:41 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy