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Unix Expr Syntax Error


share|improve this answer answered Jul 13 '12 at 5:52 mgorven 22.4k43790 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign XavierP View Public Profile View LQ Blog View Review Entries View HCL Entries View LQ Wiki Contributions Visit XavierP's homepage! Browse other questions tagged bash or ask your own question. Every polynomial with real coefficients is the sum of cubes of three polynomials Development of retrosynthesis plan If two topological spaces have the same topological properties, are they homeomorphic? http://crimsonskysoftware.com/syntax-error/unix-expr-substr-syntax-error.html

Why do we need blockchains? expr examples expr text : '.*' Performs a regular expression match. 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 was the first operating system to feature a separate kernel? their explanation

Expr Syntax Error Multiplication

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  1. Given a limit with notation f, how would you solve?
  2. 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
  3. 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
  4. Why does bash think the file ends too soon, rather than the line?
  5. Do pulled hair from the root grow back?

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. Is giving my girlfriend money for her mortgage closing costs and down payment considered fraud? You should also mention the shell you're using (usually bash). Expr Syntax Error Mac Why doesn't the expr utility know 1+1 is supposed to be interpreted as an integer, the sum of 1 and 1?

That is, you must have blank space before the trailing ] as well as after the leading [. Expr Syntax Error Bash 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 What would have happened to the world if the sepoy mutiny of 1857 had suceeded? http://serverfault.com/questions/407367/how-to-avoid-syntax-error-on-missing-command-line-arguments So, I'm trying another technique.

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 In Ksh Forum Operations by The UNIX and Linux Forums current community blog chat Server Fault Meta Server Fault your communities Sign up or log in to customize your list. YesNo Feedback E-mail Share Print Search Recently added pages View all recent updates Useful links About Computer Hope Site Map Forum Contact Us How to Help Top 10 pages Follow us Print some JSON What is way to eat rice with hands in front of westerners such that it doesn't appear to be yucky?

Expr Syntax Error Bash

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. http://stackoverflow.com/questions/30497074/i-am-getting-expr-syntax-errors-in-bash-shell-for-a-simple-program Is Certificate validation done completely local? Expr Syntax Error Multiplication Why is this Sudoku Skyscraper Failing? Expr Syntax Error In Unix Shell Script Why does my capsule collider fall without my object (Unity)? "Full-time Employment is a Loophole in the Law to Make Wages Lower"?

For maximum compatibility across older versions of bash, it is recommended to store the pattern to be matched in a separate variable and expand it without quotes. navigate here I appreciate it though :) –123 May 28 '15 at 9:20 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign Do pulled hair from the root grow back? Why to call expr to handle integers? Expr Index Syntax Error

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). up vote 0 down vote favorite How to avoid syntax error on missing command line arguments? 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 Check This Out Development of retrosynthesis plan Disproving Euler proposition by brute force in C Why is the FBI making such a big deal out Hillary Clinton's private email server?

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 Expr Syntax In Unix Shell Script ARG1 / ARG2 arithmetic quotient of ARG1 divided by ARG2. Why does Deep Space Nine spin?

The line if [ "$num" -ge 0]; then should thus be rewritten to say: if [ "$num" -ge 0 ]; then For more details on [ syntax, see the output of

What object can prove the equations? Is there a developers image of 16.04 LTS? Please suggest. Expr Match Syntax Error Does Nietzsche's rejection of Socrates mean that he is a relativist about ethics?

How can I make two cutting lines close to each other? 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 An interactive shell need not exit. this contact form Join our community today!

Join them; it only takes a minute: Sign up unix expr: syntax error up vote 0 down vote favorite Why is the following expression giving me a expr: syntax error? STRING : REGEXP anchored pattern match of regular expression REGEXP in STRING. echo "${filename}" I have got into the habit of always putting quotes round string variables and strings because it prevents so many silly errors when a value contains spaces. In lightning component, are only html items responsive at all?

ARG1 % ARG2 arithmetic remainder of ARG1 divided by ARG2. Simple script Hot Network Questions Before I leave my company, should I delete software I wrote during my free time? If the strings match exactly, character-for-character, the result will be 1 (true). UPDATE: The reason for not using is mostly because they are easier to miss. –tusharkant15 Apr 9 '15 at 16:37 | show 9 more comments 4 Answers 4 active oldest votes

Modify functions in R using body, formals and environment methods Die Liebe höret nimmer auf In lightning component, are only html items responsive at all? very lightweight low power microcontroller with memory? "Full-time Employment is a Loophole in the Law to Make Wages Lower"? Watching order for the Dan Brown films? Watching order for the Dan Brown films?

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