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Top Forums Shell Programming and Scripting Expr: non-numeric argument syntax error on line 1, teletype Post 303006307 by nms on Tuesday 31st of October 2017 08:41:22 AM
Old 10-31-2017
Wrench Expr: non-numeric argument syntax error on line 1, teletype

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

Code:
expr: non-numeric argument
syntax error on line 1, teletype

After some research, it seems that the problem relates to bc.
I have the following part from the script:

Code:
FREE=`df -g $i | grep files | awk '{print$1}' | tail -1`
TOTAL=`df -g $i | grep files | awk '{print$9}' | head -1`
USED=`expr $TOTAL - $FREE`
USED_PER=`echo "scale = 5; ($USED / $TOTAL)*100" | bc`
USED_PER=`printf %0.f $USED_PER`
OUTPUT=`echo $DATE "|" $i "|" $USED_PER`

and changed the above to the below, however issue is still persisting. While performing bash -x, i noticed that all values are being retrieved, but noticed that some values are negative or float.

Code:
FREE=$(df -g $i | grep files | awk '{print$1}' | tail -1)
TOTAL=$(df -g $i | grep files | awk '{print$9}' | head -1)
USED=$(expr $TOTAL - $FREE)
USED_PER=$(echo "scale = 5; ($USED / ($TOTAL))*100" | /usr/bin/bc)
USED_PER=`printf %0.f $USED_PER`
OUTPUT=`echo $DATE "|" $i "|" $USED_PER`

Can someone shed some light on what could be the problem?

Last edited by Scott; 10-31-2017 at 09:46 AM.. Reason: Use code tags, please...
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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