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Bash Expr Syntax Error

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Browse other questions tagged bash expr or ask your own question. That's something you don't see every day; I'm really impressed. Hot Network Questions How to map and sum a list fast? What does the "Phi" sign stand for in musical notation? http://sovidi.com/syntax-error/bash-expr-index-syntax-error.php

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Expr Index Syntax Error

This discussion is locked Andreas Haselbacher Level 1 (5 points) Q: bash: "expr index string1 string2" gives "syntax error" In a bash script, I was trying to use the commandexpr index It also prevents errors like this: Code: # Didn't recognise variable fred="abc" echo $fred42 sh: fred42: Parameter not set. # Spaces disappeared fred="abc" echo ${fred}42 displaced abc42 displaced # All working Password Home Search Forums Register Forum RulesMan PagesUnix Commands Linux Commands FAQ Members Today's Posts Shell Programming and Scripting Unix shell scripting - KSH, CSH, SH, BASH, PERL, PHP, SED, AWK However, it's not really necessary to call the external expr1 to do mathematical manipulation and capture the output to a variable.

Can Customs make me go back to return my electronic equipment or is it a scam? bash has a amazing arithmetic expansion share|improve this answer edited Apr 9 '15 at 17:51 answered Apr 9 '15 at 16:25 Helio 2,69031640 I have updated the new script. That also seems to be a strange use of the word "index." I would have expected it to find the index of a substring, which seems to be pretty common usage Expr Length Syntax Error Can I use an HSA as investment vehicle by overcontributing temporarily?

For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This problem occurs for all parameters of expr, including the length parameter. All Rights Reserved. Dennis numbers 2.0 When taking passengers, what should I do to prepare them?

Join them; it only takes a minute: Sign up I am getting expr syntax errors in bash shell for a simple program up vote 1 down vote favorite #!/bin/bash clear echo Bash Expr Example Can I use an HSA as investment vehicle by overcontributing temporarily? I'm trying to write a script that calculates combinations, but I think I get overflows when trying to calculate faculties. Browse other questions tagged bash scripting shell-scripting or ask your own question.

  1. I'm pretty sure having double quotes around it in a script makes a difference, but that might just be to do with $variables within the "s.
  2. It's more readable and shortens the code.
  3. For eg, the way I'm assigning tot_rec_count.
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Mac Expr Syntax Error

User contributions on this site are licensed under the Creative Commons Attribution Share Alike 4.0 International License. Contact Us - Advertising Info - Rules - LQ Merchandise - Donations - Contributing Member - LQ Sitemap - Main Menu Linux Forum Android Forum Chrome OS Forum Search LQ Expr Index Syntax Error If parameter is unset or null, the expansion of word (or a message indicating it is unset if word is omitted) is written to standard error and the shell exits with Math Shell Script Why write an entire bash script in functions?

Please explain the local library system in London, England Can a creature benefit from differently typed speed bonuses all named fast movement? his comment is here Andreas Helpful (0) Reply options Link to this post by Gary Kerbaugh, Gary Kerbaugh Apr 11, 2007 6:58 PM in response to LittleSaint Level 6 (18,040 points) Apr 11, 2007 6:58 shell-scripting share|improve this question asked Jul 13 '12 at 5:21 Ahn 661510 add a comment| 2 Answers 2 active oldest votes up vote 2 down vote accepted You can check missing Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the Expr Syntax Error Multiplication

For example: #!/bin/sh var1="${1:?[Please specify the first number to add.]}" var2="${2:?[Please specify the second number to add.]}" Which then does this: % ./test.sh ./test.sh: 2: ./test.sh: 1: [Please specify the first Please post it as an answer and I will check it off =] –Jeffrey L. How to increase the population growth of the human race Were slings used for throwing hand grenades? this contact form asked 3 years ago viewed 649 times active 10 months ago Related 1Why is this bash script not working?2awk + perl + get two arguments in to awk syntax2Command does not

I cannot recall the last time something like that happened in politics or religion.-- Carl Sagan, 1987 CSICOP keynote address Helpful (0) Reply options Link to this post This site contains Bash Expr Float Does mean=mode imply a symmetric distribution? Integral using residue theorem complex analysis How rich can one single time travelling person actually become?

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Note, however, that this must be `, same as the opening backquote. You could install/compile GNU expr or use this:echo string1 | sed -n "s/[string2].*//p" | wc -cNote the double quotes in the sed statement otherwise string2 will not be expanded. Let me point out that your zsh script isn't quite right yet. Bash Expr Division This more modern syntax is preferred. $((arithmetic)).

In bash, [ is a command (and in fact there is even a separate [ executable, as unlike bash some shells don't provide a [ builtin). By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Is 8:00 AM an unreasonable time to meet with my graduate students and post-doc? navigate here Quotes seem to act differently in interactive shells compared to automated.

In this technique I used this: a=`expr $var1 \* $var2 / $var3` This is giving errors, and apperently, I can't do this: a=`expr ($var1 \* $var2) / $var3` because this gives Is there a way to make a metal sword resistant to lava? Browse other questions tagged shell or ask your own question. See below for details.

The time now is 01:25 AM. share|improve this answer edited Aug 31 '14 at 8:29 answered Aug 30 '14 at 23:10 Tom Fenech 38.6k53063 add a comment| Your Answer draft saved draft discarded Sign up or If not, there's nothing preventing you from writing another answer to cover that. Find More Posts by XavierP View Blog 06-06-2005, 03:14 AM #4 baosheng Member Registered: Oct 2004 Location: Lubbock, TX, USA Distribution: Ubuntu 7.10 Posts: 74 Original Poster Rep: it