I am trying to write a script which empties file which is reaches 19% or more. I have the following code:
#!/bin/sh
ALERT="19" # setting alert to 19
df -h | grep /tmp | awk '{print $4}' | while read output; # reading the file system
do
echo $output
usep=$(echo $output | awk '{print $4}' | cut -d'%' -f1 )
if [ $usep -gt ALERT ]; then
cd /tmp
cat /dev/null > purge_foreign_mdn.log # filename
fi
done
I am getting this error:
purge_file.sh: line 10: [: -gt: unary operator expected
I tried -gt "19" and -gt '19'. Still getting different errors but at the same line.
You need to use $ALERT, not ALERT. As it is, you are comparing the $usep variable to the string ALERT, not the variable called $ALERT.
Related
This script should output a warning notification for the utilization of the main disk if over 50%, but it provides no output. My disk is currently sat at 60% so it should in theory work.
I have added an else statement to identify if the loop is not working but the else statement isnt triggered.
I'm provided no error so its hard to identify where i have gone wrong specifically.
#!/bin/bash
df -H | grep /dev/sda2 | awk '{ printf "%d", $5}' > diskOutput.txt
input="diskOutput.txt"
while IFS= read -r line
do
if [ $line -gt 50 ]
then
up="`uptime | cut -b 1-9`"
output="WARNING UTILISATION $line - $up"
echo "$output"
else
echo "no-in"
fi
done < $input
#rm diskOutput.txt
echo "finished"
Try this.
#!/bin/bash
df -H | grep /dev/sda2 | awk '{ printf "%d", $5}' > diskOutput.txt
echo "" >>diskOutput.txt
input="diskOutput.txt"
while IFS= read -r line
do
if [ $line -gt 50 ]
then
up="`uptime | cut -b 1-9`"
output="WARNING UTILISATION $line - $up"
echo "$output"
else
echo "no-in"
fi
done < $input
#rm diskOutput.txt
echo "finished"
You are setting an internal field separator as space here.
while IFS= read -r line
But when creating file, with %d you are removing all char except digits.
#!/bin/bash
# I get the newest file in Directory
latest_file=$(ls -t | head -n 1)
getAlldoublicate()
# getting Token syntax error here getAlldoublicate() '{
{
Alldoublicate=$(tr -s ',' ' ' <latest_file | awk '{print $2" "$3" "$4}' | uniq -d)
# here I try to find dublicate rows in csv
}
if [[ -s latest_file]] ; then
# here I check if file is emty
getAlldoublicate
else
cat "$latest_file" | mailx -s "$latest_file is empty" bla..`#bla
fi
I guess this is your code.
#!/bin/bash
# I get the newest file in Directory
latest_file=$(ls -t | head -n 1)
# getting Token syntax error here
getAlldoublicate()
{
# here I try to find dublicate rows in csv
Alldoublicate=$(tr -s ',' ' ' < $1 | awk '{print $2" "$3" "$4}' | uniq -d)
}
if [[ -s $latest_file ]]; then
# here I check if file is emty
getAlldoublicate $latest_file
else
cat $latest_file | mailx -s "$latest_file is empty" bla.. #bla
fi
Three points you need to pay attention:
function must be defined first before being use.
You can pass the latest_file as an argument when calling getAlldoublicate. Then you could use it by $1 in the function. ($0 stands for the function being called itself).
It would be better if you read the How to Format Tutorials before asking questions.
We are running to script to find the zfs file system monitoring and having error as below.
argument expected
#!/bin/sh
USED_SPACE_PERCENT_WARN=20
PATH=/usr/bin:/usr/sbin; export PATH
# check zfs File system
if [ `df -F zfs | wc -l` -gt 0 ]; then
/usr/sbin/zpool list -H | while read line
do
USED_SPACE_PERCENT=`echo "$line" | nawk -F'[ % ]+' '{print $5}'`
if [ $USED_SPACE_PERCENT -gt $USED_SPACE_PERCENT_WARN ]; then
POOL=`echo "$line" | nawk -F'[ % ]+' '{print $1}'`
echo "ZFS pool $POOL has used $USED_SPACE_PERCENT% of its space."
fi
done
fi
When USED_SPACE_PERCENT is empty (line without 5 fields), the command
if [ $USED_SPACE_PERCENT -gt $USED_SPACE_PERCENT_WARN ]; then
will turn into
if [ -gt 20 ]; then
and that causes the error
I'm trying to get this to work when the "line" is in the format ###.###
Example line of data:
Query_time: 188.882
Current script:
#!/bin/bash
while read line; do
if [ $(echo "$line" | cut -d: -f2) -gt 180 ];
then
echo "Over 180"
else
echo "Under 180"
fi
done < test_file
Errors I get:
./calculate: line 4: [: 180.39934: integer expression expected
If you have:
line='Query_time: 188.882'
This expression:
$(echo "$line" | cut -d: -f2) -gt 180
Will give an error invalid arithmetic operator since BASH cannot handle floating point numbers.
You can use this awk command:
awk -F ':[ \t]*' '{print ($2 > 180 ? "above" : "under")}' <<< "$line"
above
You can use this awk:
$ echo Query_time: 188.882 | awk '{ print ($2>180?"Over ":"Under ") 180 }'
Over 180
It takes the second space delimited field ($2) and using conditional operator outputs if it was over or under (less than or equal to) 180.
I am trying to run the below script.
val = `wc -l /home/validate.bad | awk '{print $1}' | tail -n1`
valCount = `wc -l /home/validation.txt | awk '{print $1}'`
if [ "$val" -gt 1 ] && ["$valCount" -gt 1]
then
mailx -s "Validation failed" -r xyz#abc.com xyz#abc.com<<-EOF
Hi ,
Validation has failed. Please check.
EOF
elif [ "$valCount" -gt 1 ]
then
mailx -s "Validation pass" -r xyz#abc.com xyz#abc.com<<-EOF
Hi Team,
Validation success.
EOF
fi
But I am getting this error.
Error:
val: comand not found
valCount: command not found
line 3[: : integer expression expected
You can't have spaces around = :
val = `wc -l /home/validate.bad | awk '{print $1}' | t` # wrong
and should have been
val=`wc -l /home/validate.bad | awk '{print $1}' | t`
or preferrably
val=$(wc -l </home/validate.bad)
#`..` is legacy , $() supports nesting, one good reason to go for it
# You use awk and tail uselessly
Also
["$valCount" -gt 1]
should have been
[ "$valCount" -gt 1 ] # mind the spaces for the test constructie
# [spaceSTUFFspace] is the correct form
Sidenote
You may use [ shellcheck ] to check your scripts.