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Unix Shell Script Expr Syntax Error


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 Split python tuple in subtuples with capacity limit in functional programming style Why are only passwords hashed? How to apply for UK visit visa after four refusal Does the reciprocal of a probability represent anything? expr syntax expr EXPRESSION expr OPTION Options --help Display a help message and exit. --version Display version information and exit. have a peek here

I also don't see how this is an Ubuntu issue, as it's a pure generic coding question and belongs on Stack Overflow, not here. –Thomas Ward♦ Apr 9 '15 at 16:01 asked 1 year ago viewed 2230 times active 2 months ago Related 0why syntax error near unexpected token ' fi '1“syntax error: unexpected end of file” simple script0How do I solve Why is the FBI making such a big deal out Hillary Clinton's private email server? Thankyou.

Expr Syntax Error Multiplication

Is Certificate validation done completely local? Why doesn't the expr utility know 1+1 is supposed to be interpreted as an integer, the sum of 1 and 1? 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?

match STRING REGEXP same as STRING : REGEXP. How do we play with irregular attendance? Minimum of a function on an open interval Is Certificate validation done completely local? Expr Syntax In Unix Shell Script Why to call expr to handle integers?

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 Expr Index Syntax Error make it easier to read.. Integer function which takes every value infinitely often What are the large round dark "holes" in this NASA Hubble image of the Crab Nebula? http://serverfault.com/questions/407367/how-to-avoid-syntax-error-on-missing-command-line-arguments That's because bash itself can do this well enough without resorting to output capture (see ARITHMETIC EVALUATION in the bash man page): #!/bin/bash clear read -p "Enter a number: " number

Contact Us - Advertising Info - Rules - LQ Merchandise - Donations - Contributing Member - LQ Sitemap - Main Menu Linux Forum Android Forum Chrome OS Forum Search LQ Expr Match 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 This is not merely a matter of idle curiosity--understanding that helps you comprehend this and other error messages in the future. 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

  • You should also mention the shell you're using (usually bash).
  • share|improve this answer edited Apr 9 '15 at 16:12 Eliah Kagan 56.5k16163256 answered Apr 9 '15 at 16:05 Florian Diesch 48.1k12109135 add a comment| up vote 1 down vote I found
  • What to do when majority of the students do not bother to do peer grading assignment?
  • thanks.
  • 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.
  • How do I handle an unterminated wire behind my wall?
  • ed — A simple text editor.
  • Instead prefer $().

Expr Index Syntax Error

I'm having hard time de-crypting what you put in this comment. –alex Nov 1 '10 at 10:10 4 @3sdmx: just don't bother with expr, use the shell arithmetic $((…)) instead. http://stackoverflow.com/questions/30497074/i-am-getting-expr-syntax-errors-in-bash-shell-for-a-simple-program Is there a developers image of 16.04 LTS? Expr Syntax Error Multiplication To check if the input is a positive integer (only unsigned digits) you can use this awesome bash regex: [[ "$number" =~ ^[0-9]+$ ]] that checks if $numbercontains only digits. Expr Syntax Error In Ksh share|improve this answer answered Oct 31 '10 at 6:44 alex 3,19431623 getcombination() { tempres=1 a=expr \( $2 - $1 \) + 1 b=1 while [ a -le $2 -a

They all relate to command-line syntax, most for bash, but in one case for the separate expr utility. http://crimsonskysoftware.com/syntax-error/unix-expr-substr-syntax-error.html 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 Enable Wireless on Fresh Debian Build "Full-time Employment is a Loophole in the Law to Make Wages Lower"? ARG1 / ARG2 arithmetic quotient of ARG1 divided by ARG2. Expr Syntax Error Mac

Split python tuple in subtuples with capacity limit in functional programming style Development of retrosynthesis plan AWS EC2 SSH from my IP address which has changed How to draw a clock-diagram? 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. Ask Ubuntu works best with JavaScript enabled Skip to Main Content Search Help Tips Dictionary History Forums Contact You are here: Help > Linux and Unix Linux and Unix expr command Check This Out 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

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 Index Syntax Error 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 Which towel will dry faster?


Not the answer you're looking for? This is because each number and arithmetic operator must be passed as a separate command-line argument to expr: [email protected]:~$ expr 1+1 1+1 [email protected]:~$ expr 1 + 1 2 To fix this Find More Posts by baosheng 06-09-2005, 03:32 PM #5 osvaldomarques Member Registered: Jul 2004 Location: Rio de Janeiro - Brazil Distribution: Conectiva 10 - Conectiva 8 - Slackware 9 Bash Shell Arithmetic User contributions on this site are licensed under the Creative Commons Attribution Share Alike 4.0 International License.

It's more readable and shortens the code. Instead of a while loop, why not a for loop? ARG1 = ARG2 ARG1 is equal to ARG2. this contact form Why cast an A-lister for Groot?

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 I am using the bash shell. Pattern matches return the string matched between \( and \) or null; if \( and \) are not used, they return the number of characters matched or 0. 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

If capturing groups are used, each group will be stored as a separate element in the array. It appears your intent is to escape the * character so it is not treated specially by the shell before being subjected to arithmetic expansion. Suggestions welcome. Output a googol copies of a string more hot questions question feed lang-sh about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback

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