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Shell Programming and Scripting
getting error with expr
Post 302146938 by bishweshwar on Friday 23rd of November 2007 05:15:15 AM
11-23-2007
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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. why?
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Hello, I am new to Shell programing.
I want to add two numbers & show result. command I use are as under
Echo Enter the two numbers
read number
d1 = ` expr $ num%10`
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d2 = ` expr $ num%10`
num = `expr $ num/10`
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if
then
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Hi,
I tried to look up the issue i'm experiencing, but i'm confused what's wrong with my script.
After executing the script I'm getting the following error
expr: non-numeric argument
syntax error on line 1, teletype
After some research, it seems that the problem relates to bc.
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LEARN ABOUT SUSE
sum
SUM(1) User Commands SUM(1) NAME
sum - checksum and count the blocks in a file SYNOPSIS
sum [OPTION]... [FILE]... DESCRIPTION
Print checksum and block counts for each FILE. -r use BSD sum algorithm, use 1K blocks -s, --sysv use System V sum algorithm, use 512 bytes blocks --help display this help and exit --version output version information and exit With no FILE, or when FILE is -, read standard input. AUTHOR
Written by Kayvan Aghaiepour and David MacKenzie. REPORTING BUGS
Report sum bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> COPYRIGHT
Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for sum is maintained as a Texinfo manual. If the info and sum programs are properly installed at your site, the command info coreutils 'sum invocation' should give you access to the complete manual. GNU coreutils 7.1 July 2010 SUM(1)