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Full Discussion: Problems with expr
Top Forums UNIX for Dummies Questions & Answers Problems with expr Post 76497 by benu302000 on Tuesday 28th of June 2005 02:28:22 PM
Old 06-28-2005
Problems with expr

I'm writing a unix script that simply does some basic command line stuff for a whole lot of similar directories (ls *.dat > foo.bar). Its my first script ever, and its going ok, except I can't, for the life of me, figure out how to get arithmetic to work in the script.

FIVE=5
MY_NUMBER='expr $FIVE + 3'
echo $MY_NUMBER

even this simple script either outputs "expr $FIVE + 3" at the command line, or fails utterly. Any Ideas? I'm writing it for the bourne shell, on a SOLARIS machine.
Smilie
 

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source(3tcl)						       Tcl Built-In Commands						      source(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME
source - Evaluate a file or resource as a Tcl script SYNOPSIS
source fileName source -encoding encodingName fileName | _________________________________________________________________ DESCRIPTION
This command takes the contents of the specified file or resource and passes it to the Tcl interpreter as a text script. The return value from source is the return value of the last command executed in the script. If an error occurs in evaluating the contents of the script then the source command will return that error. If a return command is invoked from within the script then the remainder of the file will be skipped and the source command will return normally with the result from the return command. The end-of-file character for files is "32" (^Z) for all platforms. The source command will read files up to this character. This restriction does not exist for the read or gets commands, allowing for files containing code and data segments (scripted documents). If you require a "^Z" in code for string comparison, you can use "32" or "u001a", which will be safely substituted by the Tcl interpreter into "^Z". The -encoding option is used to specify the encoding of the data stored in fileName. When the -encoding option is omitted, the system | encoding is assumed. EXAMPLE
Run the script in the file foo.tcl and then the script in the file bar.tcl: source foo.tcl source bar.tcl Alternatively: foreach scriptFile {foo.tcl bar.tcl} { source $scriptFile } SEE ALSO
file(3tcl), cd(3tcl), encoding(3tcl), info(3tcl) KEYWORDS
file, script Tcl source(3tcl)
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