Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
I am pretty close I think, but stuck. I don't know how to send an email to the user specified on the command line, and I receive an error stating -ge expecting a unary value(lines 13 and 17), and ']' missing. The class is not on shell scripting, and I managed all of this from scratch myself so any help would be appreciated. I don't know why the variable and comparison isn't working.
1. The problem statement, all variables and given/known data:
Create a script sends an email message to the user specified on the command line if any of the filesystems at more than 70% of capacity. The script should not process special filesystems as /proc on the ce.uml.edu. It should only process filesystems which are either locally mounted or are mounted via NFS.
An individual email should be sent for each filesystem which is at the warning level. There should be a subject on the email with a message "Warning: Filesystem <put filesystem the>here is at <X>% of capacity" If the filesystem is at greater than 90% of capacity, the "Warning" should be changed to "Critical Warning".
You may use any scripting language including /bin/sh, ksh, bash, awk or perl. Work done in the C-Shell (csh) will not be accepted. This assignment may be done either on ce.uml.edu or on your own Linux/UNIX system.
2. Relevant commands, code, scripts, algorithms:
3. The attempts at a solution (include all code and scripts):
Code:
#!/bin/sh
# set -x # Uncomment to debug this script
# set -n # Uncomment to check syntax without any execution
# Shell script to monitor or watch the disk space
####Main Script####
df -H | grep -vE '^Filesystem | none' | awk '{ print $1 " " $5 }' | while read
do
echo $output
perc=$(echo $output | awk '{ print $1 }' | cut -d'%' –f1)
part=$(echo $output | awk '{ print $2 }' )
if [ $perc -ge 90 ]; then
echo "Critical Warning: Filesystem \"$part\" at “$perc”% of capacity |
mail -s "Critical Warning: Filesystem \”$part\” at “$perc”% of capacity”
elif [ $perc -ge 70 && $perc -lt 90 ]; then
echo "Warning: Filesystem \"$part\" at “$perc”% of capacity |
mail -s "Warning: Filesystem \”$part\” at “$perc”% of capacity”
fi
done
4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
University of Mass, Lowell, Unix/Linux System Admin 90.321-061, Professor Michael Richards, Michael_Richards@uml.edu
Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).
Last edited by DukeNuke2; 03-26-2012 at 07:00 PM..
1) you need to read into a variable (I assume output). The syntax would be something like command | while read output. Possibly this is a cut/past error when sharing your code.
2) You are missing ending double quotes in your echo statements that are being used to fill the body of the mail.
3) Your mail commands need to be on the same line as your echo (this might have been a copy/past problem and not something wrong in your code)
4) You are assigning the percentage and partition backwards. The output from the df command is partition ($1) then percentage ($2), but you are assigning percentage from $1 and partition from $2.
5) The reason you are getting 'missing ]' errors is because you cannot use && as a part of a single bracketed expression. The easy fix is to make this two expressions:
Code:
if [ $a = "foo" ] && [ $b = "bar" ]
then
I'm not sure that old Bourne shell (sh) supports this, so you might consider using ksh or bash instead.
Hope these suggestions get you going again.
---------- Post updated at 19:59 ---------- Previous update was at 19:52 ----------
Also thought I'd toss in a quick trick. You could make things a bit more efficient by reading directly into your percentage and partition variables. Consider this small script:
Code:
ls -al | awk '{printf( "%d %s\n", $5, $NF}' | while read size name
do
echo "name=$name size=$size bytes"
done
Using printf with %d will also remove your trailing percent sign without the need for invoking a cut process.
You can use a single backslash at the end of the line to make the two lines be read as one line by the Shell.
Don't forget the email address on the "mail" line. If you are using Linux then "mail" is usually the right command. If you are using unix then "mailx" is the right command.
echo "Critical Warning: Filesystem \"$part\" at “$perc”% of capacity" | \
mail -s "Critical Warning: Filesystem \”$part\” at “$perc”% of capacity” mailaccount@domain.com
I made the suggested corrections, but am still receiving the following error messages...
Code:
cut: you must specify a list of bytes, characters, or fields
Try `cut --help' for more information.
diskcapacity.sh: line 13: [: -ge: unary operator expected
diskcapacity.sh: line 17: [: -ge: unary operator expected
I am assuming that something is wrong with the cut syntax, and is causing the errors on 13 and 17. Data isn't getting passed to the variable correctly, but I can't seem to figure it out. The corrected script follows...
Code:
#!/bin/bash
# set -x # Uncomment to debug this script
# set -n # Uncomment to check syntax without any execution
# Shell script to monitor or watch the disk space
####Main Script####
df -H | grep -vE '^Filesystem | none' | awk '{ print $1 " " $5 }' | while read $output
do
echo $output
perc=$(echo $output | awk '{ print $2 }' | cut -d'%' –f2 )
part=$(echo $output | awk '{ print $1 }' )
if [ $perc -ge 90 ]; then
echo "Critical Warning: Filesystem \"$part\" at “$perc”% of capacity” | \
mail -s "Critical Warning: Filesystem \”$part\” at “$perc”% of capacity” clay@clay-ubuntu.com
elif [ $perc -ge 70 ] && [ $perc -lt 90 ]; then
echo "Warning: Filesystem \"$part\" at “$perc”% of capacity” | \
mail -s "Warning: Filesystem \”$part\” at “$perc”% of capacity” clay@clay-ubuntu.com
fi
done
Last edited by methyl; 03-29-2012 at 06:57 AM..
Reason: please use code tags
A few minor corrections.
1) Lose the $ from $output on the "while read" line. We only have the $ when referring to the value of a variable.
2) Put double quotes round your string variable $output. It contains two values separated with a space character.
3) The percentage field is like 90% . Therefore the number bit is -f1 not -f2 in the cut statement.
Thanks for the help. I made the suggested corrections, but still receive the error message about cut, -ge and an expected unary operator in lines 13 and 17 when I run the script.
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03-26-2012
