bash script

noir911 · 01-20-2009, 05:14 PM

I'm trying to write a script that will calculate a directory size and if the size is greater than 4GB, it will send out an email. But I am getting the "integer operation expected" error when it tries to calculate the current disk size. Here's my script. Thanks for any help:

Code:

TO="user@email.com"

SUBJ="Ready for DVD burning on `hostname`"

MAIL="/bin/mail"

# 4GB
SIZE="4294967296"

# check the current size
CHECK="`du /data/sflow_log/`"

if [ "$CHECK" -gt "$SIZE" ]; then
        "$MAIL" -s "$SUBJ" "$TO" < notice_email
else
        exit 1
fi

colucix · 01-20-2009, 05:25 PM

The output of du contains two items: the size of the directory and the directory name. Hence you have to parse the output stripping out the directory name, otherwise the expression -gt (integer comparison) fails. For example:

Code:

CHECK=$(du -bs /data/sflow_log | awk '{print $1}')

the -b option gives the size in bytes (otherwise default is kbytes) and the -s option prevents du to give the size of each subdirectory inside /data/sflow_log, resulting in a multi-line output. Finally the awk command extract the first field of the output line, that is the size only. Hope this helps.