UNIX for Dummies Questions & Answers

 
#!/bin/sh
df -B / | awk '{ print $5 " " $1 }' | while read output;
do
echo $output
if [ $output -ge 85 ]; then
    echo "Running out of space \ HOSTNAME"
#     mail -s "Alert: Almost out of disk space root file system" USER_email
fi
done

./check*
Capacity Filesystem
./check.sh: test: unknown operator Filesystem

df -B / | awk '{ print $5 " " $1 }' | while read output;

if [ $output -ge 85 ]; then

if [[ $output -ge 85 ]]; then

 
#df -B /
Filesystem          512-blocks     Used Available Capacity Mounted on
/dev/root             16421294 14270320   2150974      87% /

#./check*
Capacity Filesystem
./check.^?4filesystem.sh: [[Capacity: not found
87% /dev/root
./check.^?4filesystem.sh: [[87%: not found

awk 'NR>1 {sub("%", "", $5); print $5 " " $1 }'

 
 
#!/bin/sh
df -B /  | awk '{ print $5 " " $1 }' | while read output;
do
  echo $output
  usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1  ) partition=$(echo $output | awk '{ print $2 }' )
  if [ $usep -ge 90 ]; then
    echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)" |
     mail -s "Alert: Almost out of disk space on $(hostname)" group_email
  fi
done

#./check2.sh
./check2.sh: syntax error at line 5: `usep=$' unexpected

VAL=$( do something to get value)

VAL=`execute blah blah `

ALERT_VALUE=85
output="$(df /|grep -v block)"
VALUE=$(echo "$output"|awk '{print $5}'|sed s/\%//g)
partition=$(echo "$output"|awk '{print $1}')
if [ $VALUE -ge $ALERT_VALUE ]
then 	echo "Running out of space \"$partition ($VALUE%)\" on $(hostname) as on $(date)" |
	mail -s "Alert: Almost out of disk space on $(hostname)" group_email
fi

usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1  ) partition=$(echo $output | awk '{ print $2 }' )

usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1  ) 
partition=$(echo $output | awk '{ print $2 }' )

usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1  ) ; partition=$(echo $output | awk '{ print $2 }' )