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Bash Script Expr Syntax Error

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Expr Syntax Error In Shell Script

I think it would have been useful to include $(()) as it does perform exactly the same as expr in regards to arithmetic. –123 May 28 '15 at 9:04 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 = The solution is not to put a backquote at the very end of the script, of course! I have also got into the habit of using curly braces even when they are not strictly necessary because it makes the variable name totally unambiguous.

Unexpected parent process id in output Force Microsoft Word to NEVER auto-capitalize the name of my company What type of sequences are escape sequences starting with "\033]" What is the sh In a GNU C macro envSet(name), what does (void) "" name mean? The following example illustrates that a declared integer is not treated as a string. $ n=6/3 $ echo $n 6/3 $ declare -i n $ n=6/3 $ echo $n 2 When Shell Script Expr Example Browse other questions tagged bash expr or ask your own question.

why? 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. For details type `warranty'. 3 + 2 5 obase=2 12 1100 Remember to type cntrl-d (EOF) to exit from interactive mode. $r=3.5 $s=`echo "$r + 2.2" | bc` $echo $s I accepted a counter offer and regret it: can I go back and contact the previous company?

Quotes seem to act differently in interactive shells compared to automated. Expr Syntax Error In Unix Shell Script Problem? Browse other questions tagged shell-scripting or ask your own question. Example shell script: var1=$1; var2=$2; echo $var1 echo $var2 var3=`expr $var1 + $var2`; echo $var3 Output : shell>sh shelltest 2 3 2 3 5 Output : shell>sh shelltest expr: syntax error

Expr Syntax Error Multiplication

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 use of back quote in value assignment to a variable and with expr command. Expr Syntax Error In Shell Script Instead of a while loop, why not a for loop? Unix Shell Script Expr My home country claims I am a dual national of another country, the country in question does not.

With Bash and Korn shell, it is generally not needed. his comment is here Finding a file starting with '-' dash Which requires more energy: walking 1 km or cycling 1 km at the same speed? 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). It's something the OP can examine if they ever need to do something more complex but I don't think I need to cover it here. –paxdiablo May 28 '15 at 8:55 Shell Script Math Expr

  1. For Example: #!/bin/bash #The following line will print no of argument provided to script #echo $# USAGE="$0 --arg1 --arg2" if [ "$#" -lt "4" ] then echo -e $USAGE; else var1=$2;
  2. Join them; it only takes a minute: Sign up Syntax error expr up vote 2 down vote favorite Why does the following returning a syntax error: stringZ=abcABC123ABCabc echo `expr match "$stringZ"
  3. declare¶ You may recall, that when the text book introduced the declare statement, it said that it is not always needed.
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Note that registered members see fewer ads, and ContentLink is completely disabled once you log in. 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 Problem? http://sovidi.com/syntax-error/bash-expr-index-syntax-error.php 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.

There is some method to do it, however it's been a long time since I've written a script. Expr Index Syntax Error This is because you can actually have newlines (i.e., line breaks) inside a backquote expression: [email protected]:~$ file `which vim > ` /usr/bin/vim: symbolic link to `/etc/alternatives/vim' So what's happening is that How to pluralize "State of the Union" without an additional noun?

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So, I'm trying another technique. thanks. Tango Icons Tango Desktop Project. Expr Syntax Error Bash Note, however, that this must be `, same as the opening backquote.

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 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 Now I know my ABCs, won't you come and golf with me? navigate here Do you want to help us debug the posting issues ? < is the place to report it, thanks !

And use indentation. –muru Apr 9 '15 at 16:02 2 I'm voting to close this question as off-topic because problems due to typos are hardly useful. –muru Apr 9 '15 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 I am using the bash shell. An interactive shell need not exit.

What are the canonical white spaces? The time now is 07:34 PM. Introduction to Linux - A Hands on Guide This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started Why write an entire bash script in functions?

Having a problem logging in? Below is code: Code: #!/usr/bin/ksh common_path_in="/interface_in/rsc" file_out="/interface_in/rsc/record_count.csv" tot_rec_count=-1 act_rec_count=-1 echo ${common_path_in} echo ${file_out} echo ${tot_rec_count} echo ${act_rec_count} set -A folders horizon mysteryshopper rcc reference echo ${folders[@]} for i in ${folders[@]} do Instead prefer $(). A name for a well-informed person who is not believed?

GTIN validation Will the medium be able to last 100 years? Why don't most major game engines use gifs for animated textures? How to handle spending money for extended trip to Europe? Assuming that you want to process file-by-file: Code: ls -1 ${common_path_in}/$i/*.csv | while read filename do tot_rec_count=`wc -l "${filename}" | cut -f1 -d' '` The Following User Says

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