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Bash Expr Substr Syntax Error


substr STRING POSITION LENGTH Returns the substring of STRING beginning at POSITION with length at most LENGTH. Not the answer you're looking for? Adopt A Jet/Book How to deal with a really persuasive character? Relations for `expr' `expr' supports the usual logical connectives and relations. http://gatoisland.com/syntax-error/bash-expr-syntax-error.php

Both arguments are coerced to numbers; an error occurs if this cannot be done. Was this page useful? Andreas Helpful (0) Reply options Link to this post by Gary Kerbaugh, Gary Kerbaugh Apr 11, 2007 6:58 PM in response to LittleSaint Level 6 (18,040 points) Apr 11, 2007 6:58 Helpful (0) Reply options Link to this post by Gary Kerbaugh, Gary Kerbaugh Apr 11, 2007 9:33 PM in response to LittleSaint Level 6 (18,040 points) Apr 11, 2007 9:33 PM

Expr Index Syntax Error

A blank line below separates increasing precedence groups. expr examples expr text : '.*' Performs a regular expression match. How to pluralize "State of the Union" without an additional noun? It is disabled when the environment variable `POSIXLY_CORRECT' is set.

Johnson ============================================================ ====== Shell Scripting Recipes: A Problem-Solution Approach, 2005, Apress Report this message « Handling escaped characters. Don't use upper case for normal variable names. ARG1 <= ARG2 ARG1 is less than or equal to ARG2. Expr Mac This is the same as STRING : REGEX.

Operands are either numbers or strings. `expr' coerces anything appearing in an operand position to an integer or a string depending on the operation being applied to it. 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 and so ... The regular expression after the colon is matched to the text before the colon.

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. Bash Substring User contributions on this site are licensed under the Creative Commons Attribution Share Alike 4.0 International License. Note: Kshell used on solaris 8. Meaning of "soul-sapping" How would family relationships change if legal system uses collective punishment?

Bash Expr Index Example

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 details and our forum data attribution, retention and privacy policy, see here Unix & Linux Forums > Top Forums > Shell Programming and Scripting Member Name Expr Index Syntax Error Mac OS X uses BSD expr which does not have the index command. Expr Syntax Error In Shell Script Numeric expressions `expr' supports the usual numeric operators, in order of increasing precedence.

This is how I am currently trying to extract the prefix: > > DELIM=`expr index "$FILENAME" _` > DELIM=`expr $DELIM - 1` > PREFIX=${FILENAME:0:$DELIM} You don't need two calls to expr http://gatoisland.com/syntax-error/bash-if-syntax-error.php You can not post a blank message. 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 If capturing groups are used, each group will be stored as a separate element in the array. Expr Syntax Error Multiplication

well actually I didn't seem to have "gawk" but "awk" worked just as well. i want to get a substring from a string and used such shell script: var_year=`expr substr "07132006" 5 4` echo $var_year but i got such error message: expr: syntax error. Is the standard Canon 18-55 lens the same as 5 years ago? this contact form Aug 8 '14 at 0:07 This question was marked as an exact duplicate of an existing question. 1 You can change the first line to.

ARG1 % ARG2 arithmetic remainder of ARG1 divided by ARG2. Try our newsletter Sign up for our newsletter and get our top new questions delivered to your inbox (see an example). Your line uses grep and awk which is not necessary as you could handle all that using awk.


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 Does mean=mode imply a symmetric distribution? Also Explain in details what you want. –val0x00ff Aug 7 '14 at 23:07 add a comment| 2 Answers 2 active oldest votes up vote 0 down vote accepted You should use Helpful (0) Reply options Link to this post by Andreas Haselbacher, Andreas Haselbacher Apr 11, 2007 2:27 PM in response to LittleSaint Level 1 (5 points) Apr 11, 2007 2:27 PM

Successful matches are stored in the BASH_REMATCH array. The "less than" symbol ("<") is preceded by a backslash ("\") to protect it from the shell, which would otherwise interpret it as a redirection operator. Apple Info Site Map Hot News RSS Feeds Contact Us Copyright © Apple Inc. navigate here The returned output is the number of characters that matched.

Intuition behind Harmonic Analysis in Analytic Number Theory In a GNU C macro envSet(name), what does (void) "" name mean? How rich can one single time travelling person actually become? Does zsh do the same?BTW, if you're using multibyte characters, the last command should be wc -m. share|improve this answer answered Aug 7 '14 at 23:22 val0x00ff 3,6671724 add a comment| up vote 0 down vote You need double quotes: IDX=`expr index "$OF" ' '` Without quotes, the

Here, the values 5 and 5 are equal, and therefore equivalent, so the output will be: 1 expr '5' = '5' Here, two strings are being compared for equivalence. asked 5 years ago viewed 3648 times active 5 years ago Related 2882Can a Bash script tell which directory it is stored in?975Check if a program exists from a Bash script1Bash If the two values being tested are not equivalent, the result is true (1), otherwise the result is false (0). 5 is equivalent to 5, so the result is false: 0 My number is correct for the bash index of a character in a character array.

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 This is how I am currently trying to extract the prefix: DELIM=`expr index "$FILENAME" _` DELIM=`expr $DELIM - 1` PREFIX=${FILENAME:0:$DELIM} I am definitely open to other ideas on how to extract Later I thought of a funny answer in which I blamed everything on the crazy shell I use.

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