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Unix Syntax Error Operand Expected


All Rights Reserved. Please help as I am a beginner to bash scripting. Disproving Euler proposition by brute force in C Modify functions in R using body, formals and environment methods How big can a planet be Development of retrosynthesis plan How to draw Last edited by crts; 08-14-2011 at 05:27 PM. have a peek here

Requirements installation successful. % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 50 0 50 0 0 63 0 --:--:-- --:--:-- To check if the input is a positive integer (only unsigned digits) you can use this awesome bash regex: [[ "$number" =~ ^[0-9]+$ ]] that checks if $numbercontains only digits. expr¶ An old Unix program that can evaluate math is expr. Please check. –Rahul Gohrani Apr 9 '15 at 17:01 I updated my post, please check ;-) –Helio Apr 9 '15 at 17:39 I shall check this. this content

Syntax Error Operand Expected Error Token Is Bash

You can only get away without rewriting if you know for sure that sh is actually bash on your system and you do not need the script to be portable (run Browse other questions tagged bash or ask your own question. They all relate to command-line syntax, most for bash, but in one case for the separate expr utility.

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  3. syntax achieves this more compactly and elegantly than eval.
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  6. 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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The time now is 10:38 PM. Which towel will dry faster? I get the same error with ((l<=)). Invalid Arithmetic Operator (error Token Is 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

Related 1Pipe error with bash script called from python0Bash script not adding variables to session-1bash variable array names and getting values-1run bash script from another script and redirect its output0Simple bash Bash (error Token Is "<= ") Please post beginner questions to learn unix and learn linux in this forum UNIX for Beginners Questions & Answers Search Forums Show Threads Show Posts Tag Search Advanced Search Unanswered Tic Tac Toe - C++14 Dozens of earthworms came on my terrace and died there How to apply for UK visit visa after four refusal Why is the FBI making such 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

How big can a planet be How do I handle an unterminated wire behind my wall? Expr: Syntax Error As @Charles Duffy points out in comments on the OP, there is potential for making your commands more efficient. But inside a $(( )) construct, one does not escape *. Script is: #!/bin/sh BACKUP_DRIVE='/backup' if [[ "$( grep $BACKUP_DRIVE /etc/fstab | awk '{print $2}')" -ne "0" ]]; then if [[ "$( df -h | grep $BACKUP_DRIVE | awk '{print $6}')" -ne

Bash (error Token Is "<= ")

The variables only get updated if you call external commands. The bc command is needed. Syntax Error Operand Expected Error Token Is Bash My advisor refuses to write me a recommendation for my PhD application unless I apply to his lab What object can prove the equations? Let: Syntax Error In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms

Output with the --debug flag: Warning! navigate here This is because echo prints a single space between each echoed argument. We recommend upgrading to the latest Safari, Google Chrome, or Firefox. Also, why sould it be set to ":"? Syntax Error In Expression (error Token Is )

crts View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by crts Page 1 of 2 1 2 > Thread Tools Show Printable Version So what do you get by declaring a variable to be an integer? Seguin [email protected], Michal Papis >[email protected] [https://rvm.io/] $ cat /proc/version Linux version 3.14.12-c9 ([email protected]) (gcc version 4.7.2 (Debian 4.7.2-5) ) >#1 SMP Tue Jul 15 16:27:48 UTC 2014 pmarreck commented Aug 6, Check This Out But when I run the script, it outputs an error: l<=: syntax error: operand expected (error token is "<=" I consulted the mighty Google and I understood it suffers from the

Quote: Originally Posted by man bash Enclosing characters in single quotes preserves the literal value of each character within the quotes. Integer Expression Expected Is there a formal way of saying 'hog'? Code: $ var= $ if (( $var >= (3 + 5) ));then echo true;else echo false;fi bash: ((: >= (3 + 5) : syntax error: operand expected (error token is ">=

The question does not have to be directly related to Linux and any language is fair game.

As we know operator + takes two operands, but here y (the second one) is missing, thus the error operand expected (error token is “+ ”). UNIX is a registered trademark of The Open Group. Since it is a command, command substitution is needed. Arithmetic In Bash I ran rvmsudo rvm get head so I should have the latest version.

In fact, over the years, multiple facilities have been added to Unix to support working with numbers. How to create a custom theme in SXA? Password Home Search Forums Register Forum RulesMan PagesUnix Commands Linux Commands FAQ Members Today's Posts UNIX for Dummies Questions & Answers This forum is closed for new posts. http://crimsonskysoftware.com/syntax-error/unix-syntax-error-unmatched.html Instead, as others have said, simply add the missing backquote where it was supposed to be.

INPUT1=/tmp/dir1 INPUT2=/tmp/dir2 INPUT3=/tmp/dir3 for i in 1 2 3 do echo $(INPUT$i) done When I run this script, tho output is: syntax error: operand expected (error token is "/tmp/dir1 bash scripts But this did not work for me. In order to become a pilot, should an individual have an above average mathematical ability? Single quotes for the assignment are best if you want to prevent all expansion there: INPUT1=/tmp/dir1 → INPUT1='/tmp/dir with spaces' (Only a ' quote character is treated specially, as it will

Kevin Barry PS You should also copy $? I'm aware of the difference between ' and ", but if you want create-prompt-infobar to be evaluated every time the prompt comes up it needs to be in single quotes. 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 Player claims their wizard character knows everything (from books).

After I manipulated LINES I issued commands like 'echo', ':' and 'cd'. Not sure why. Remove advertisements Sponsored Links methyl View Public Profile Find all posts by methyl #3 05-09-2011 metal005 Registered User Join Date: May 2011 Last Activity: 23 March 2015, 9:42 Is there a formal way of saying 'hog'?

COLUMNS is not assigned anywhere, as far as I know bash assigns it automatically. You should write your for loop as: k=0 for ((l=${hitStart[0]};k<${#hitEnd[@]} && l<=${hitEnd[k]};l++)); do so as to always have an index k that corresponds to a defined field in the array ${hitEnd[@]}. How big can a planet be making new symbol from two symbols Why is this Sudoku Skyscraper Failing? Terms Privacy Security Status Help You can't perform that action at this time.

But if you really want to make an array of those specific values, I recommend: input=(/tmp/dir{1..3}) Similarly, if your goal is just to loop through /tmp/dir1, /tmp/dir2, and /tmp/dir3 and perform This form is more forgiving about spaces. $ ((e=5)) $ echo $e 5 $ (( e = e + 3 )) $ echo $e 8 $ (( e=e+4 )) # -- rarity? If two topological spaces have the same topological properties, are they homeomorphic?

But you have to treat the variables as strings.