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Bash Script Expr Syntax Error


Ask Ubuntu works best with JavaScript enabled current community blog chat Server Fault Meta Server Fault your communities Sign up or log in to customize your list. As this variable is not numeric anymore, the test operator "[" returns an error as it is comparing a non numeric variable using the numeric comparator "-lt". Hopefully the update will address your concerns. 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 this contact form

Adv Reply June 19th, 2008 #4 pedro_orange View Profile View Forum Posts Private Message Extra Foam Sugar Free Ubuntu Join Date Nov 2007 Location UK Beans 772 DistroUbuntu 8.04 Hardy Regards, Jagari ---------- Post updated at 10:25 AM ---------- Previous update was at 10:23 AM ---------- The while loop reads each filename and then counts the number of records in each Not the answer you're looking for? You should also mention the shell you're using (usually bash).

Expr Syntax Error In Shell Script

How to increase the population growth of the human race Intuition behind Harmonic Analysis in Analytic Number Theory Please explain the local library system in London, England more hot questions question Did Donald Trump call Alicia Machado "Miss Piggy" and "Miss Housekeeping"? They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own. 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

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  • bash expr share|improve this question asked Aug 30 '14 at 23:00 rudolph9 4,00073163 Have you tried using echo $(expr match "$stringZ" 'abc[A-Z]*.2')? –Tom Fenech Aug 30 '14 at 23:04
  • share|improve this answer answered Jul 13 '12 at 5:52 mgorven 22.2k43789 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign
  • thanks.
  • This problem occurs for all parameters of expr, including the length parameter.

I submitted an answer as well. –Rahul Gohrani Apr 9 '15 at 17:52 Please check mine, I think that will help you to make a clean code. –Helio Apr Finding a file starting with '-' dash Which requires more energy: walking 1 km or cycling 1 km at the same speed? As you can see, it is picky about spaces. $ z=5 $ z=`expr $z+1` ---- Need spaces around + sign. $ echo $z 5+1 $ z=`expr $z + 1` $ echo Shell Script Expr Example use of back quote in value assignment to a variable and with expr command.

I dont get your logic: Once your are reading A (yes 1!) filename what is the point to go through all this strange calculation and no storing of $filename (???), I Expr Syntax Error Multiplication American English: are [ə] and [ʌ] different phonemes? See below for details. more hot questions question feed lang-bsh about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation

To keep with script programming paradigm and allow for better math support, languages such Perl or Python would be better suited when math is desired. Expr Syntax Error In Unix Shell Script Find More Posts by baosheng 06-06-2005, 02:55 AM #2 slackie1000 Senior Member Registered: Dec 2003 Location: Brasil Distribution: Arch Posts: 1,037 Rep: hi there, i think this post is Related 0Syntax error Using expr substr in bash script0unix expr: syntax error2Multiplication with expr in shell script0Error “expr: command not found” in bourne script-1bash expr syntax error when multiplying variable by It's more readable and shortens the code.

Expr Syntax Error Multiplication

This is free software with ABSOLUTELY NO WARRANTY. Click Here to receive this Complete Guide absolutely free. Expr Syntax Error In Shell Script no outgoing connection via ipv4 Do COB LEDs usually need electrically insulating from the heatsink? Unix Shell Script Expr In bash you can also use built-in arithmetic expansion like this: echo $(( ($var1+$var2)/$var3 )) And for infix calculations there's bc (while dc is for reverse-polish notation).

A simple visual puzzle to die for My home country claims I am a dual national of another country, the country in question does not. http://waspsoft.com/syntax-error/bash-script-syntax-error.html If the error message had said the error was an end of line in the backquote substitution, you would probably have immediately recognized the problem (provided you know that ` is The solution is not to put a backquote at the very end of the script, of course! more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Shell Script Math Expr

All Rights Reserved. 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 up vote -2 down vote favorite When running the script below, I get an error: The script is: clear echo "Enter a num" read num if [ "$num" -ge 0]; then http://waspsoft.com/syntax-error/bash-expr-substr-syntax-error.html shell share|improve this question edited Oct 29 '11 at 4:13 John 2001310 asked Oct 30 '10 at 20:09 3sdmx 12114 What errors are you getting?

I've done the coding in vi editor and have not used MS editor. Expr Index Syntax Error Results 1 to 5 of 5 Thread: [SOLVED] 'expr' command problems Thread Tools Show Printable Version Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Why does Windows show "This device can perform faster" notification if I connect it clumsily?

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

Why? In bash, [ is a command (and in fact there is even a separate [ executable, as unlike bash some shells don't provide a [ builtin). My girlfriend has mentioned disowning her 14 y/o transgender daughter What does the "Phi" sign stand for in musical notation? Expr Syntax Error Bash Good way to explain fundamental theorem of arithmetic?

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« Previous Thread | Next Thread » Thread Tools Show Printable Version Email this Page Subscribe to In summary: The original problem related to an unmatched ` in a backquote expression (and more generally, how to close a backquote expression and how newlines inside backquote expressions are handled http://waspsoft.com/syntax-error/bash-expr-index-syntax-error.html I am getting a bunch of expr syntax errors.

Here is what happens when we try to do floating point math with the shell: $let r=3.5 -bash: let: r=3.5: syntax error in expression (error token is ".5") $(( r = Now I know my ABCs, won't you come and golf with me? bc may either be run interactively, or as a shell script command. But inside a $(( )) construct, one does not escape *.

Can filling up a 75 gallon water heater tank without opening a faucet cause damage? That is, you must have blank space before the trailing ] as well as after the leading [. What are the holes on the sides of a computer case frame for? share|improve this answer edited Apr 9 '15 at 16:12 Eliah Kagan 55.9k15162255 answered Apr 9 '15 at 16:05 Florian Diesch 46.7k12105131 add a comment| up vote 1 down vote I found

Neither form of let, supports floating point numbers. The problem was with - Code: tot_rec_count=`wc -l ${common_path_in}/$i/*.csv | cut -f1 -d' '` It worked correctly with $filename as you suggested. The question does not have to be directly related to Linux and any language is fair game. Realism of a setting with several sapient anthropomorphic animal species How to deal with a very weak student?

The following taken from the aforementioned site: Code: if [ -f $filename ] translates $filename - if it has spaces the shell "thinks" $filename is really separate values with no spaces EOF is not inherently an error condition, but when an EOF is an error it usually means the interpreter thinks your program has ended prematurely--it was anticipating something, which never occurred let also relaxes the normal rule of needing a $ in front of variables to be read. $ let z=5 $ echo $z 5 $ let z=$z+1 $ echo $z 6 SYNOPSIS bc bc EXPRESSION Here are some examples: $ bc bc 1.06 Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.

Hot Network Questions Religious supervisor wants to thank god in the acknowledgements How's the CMD trip bonuses from extra legs work? How does the pilot control the Dassault Rafale? For example, This works: Code: $ temp='Fantastic' $ expr substr $temp 1 3 Fan Whereas this doesn't: Code: $ temp='Fantastic work' $ expr substr $temp 1 3 expr: syntax error The Password Protected Wifi, page without HTTPS - why the data is send in clear text?

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