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Full Discussion: Expr: non-numeric argument syntax error on line 1, teletype
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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LEARN ABOUT BSD

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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