Debugging Help Needed

ETC Homework & Coursework Questions
1

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I am VERY much a neophyte with shell scripting. I am working on the following,

  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 file
systems at more than 60% of capacity. The script should not process special file systems as /proc on
the ce.uml.edu. It should only process file systems which are either locally mounted or are mounted
via NFS.""Create a script sends an email message to the user specified on the command line if any of the file
systems at more than 60% of capacity. The script should not process special file systems as /proc on
the ce.uml.edu. It should only process file systems which are either locally mounted or are mounted
via NFS."

  1. Relevant commands, code, scripts, algorithms:

  2. The attempts at a solution (include all code and scripts):

#!/bin/bash
#  script to send an email message to the user specified on the command line if
# any of the file systems at more than 60% of capacity.

df -H | grep -vE '^Filesystem' | 'none' | awk '{ print $1 " " $5 }' | while read fsout
do
  echo "$fsout"
  partition=$(echo "$fsout" | awk '{ print $2 }' )
  usage=$(echo "$fsout" | awk '{ print $1 }' | cut -d'%' -f1)

  if [ $usage -ge 90 ]
  then
    echo "CRITICAL WARNING!!: Filesystem \"$partition\" at "$usage"% of capacity" |
    mail -s "CRITICAL WARNING!!: Filesystem \"$partition\" at "$usage"% of capacity" emailaddress@student.uml.edu

  elif [ $usage -ge 60 ] && [ $usage -lt 90 ]
  then
    echo "Warning!!: Filesystem \"$partition\" at "$usage"% of capacity" |
    mail -s "Warning!!: Filesystem \"$partition\" at "$usage"% of capacity" emailaddress@student.uml.edu
  fi
done
  1. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
    University Of Massachusetts, Lowell, USA, Michael Richards, Linux/Unix System Administration

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).

I am getting these errors:

./fsc.sh: line 4: $'\r': command not found
./fsc.sh: line 16: syntax error near unexpected token `elif'
'/fsc.sh: line 16: `  elif [ $usage -ge 60 ] && [ $usage -lt 90 ]

Any help is greatly appreciated.

2

It appears your script has Windows style carriage return (CR) characters ( \r ) present, which are messing up things.
These can be removed like this:

tr -d '\r' < oldscript > newscript

--
Unix/Linux uses LF line endings (Line Feed), while Windows uses CRLF endings (Carriage Return / Line Feed).

3

We're getting closer.

Now getting

./fsc2.sh: line 11: [: udev: integer expression expected
./fsc2.sh: line 16: [: udev: integer expression expected
tmpfs 1%
./fsc2.sh: line 11: [: tmpfs: integer expression expected
./fsc2.sh: line 16: [: tmpfs: integer expression expected
/dev/dm-0 5%
./fsc2.sh: line 11: [: /dev/dm-0: integer expression expected
./fsc2.sh: line 16: [: /dev/dm-0: integer expression expected
none 0%
./fsc2.sh: line 11: [: none: integer expression expected
./fsc2.sh: line 16: [: none: integer expression expected
none 0%
./fsc2.sh: line 11: [: none: integer expression expected
./fsc2.sh: line 16: [: none: integer expression expected
none 1%
./fsc2.sh: line 11: [: none: integer expression expected
./fsc2.sh: line 16: [: none: integer expression expected
none 1%
./fsc2.sh: line 11: [: none: integer expression expected
./fsc2.sh: line 16: [: none: integer expression expected
/dev/sda1 14%
./fsc2.sh: line 11: [: /dev/sda1: integer expression expected
./fsc2.sh: line 16: [: /dev/sda1: integer expression expected
ce.uml.edu:/users/ 16%
./fsc2.sh: line 11: [: ce.uml.edu:/users/: integer expression expected
./fsc2.sh: line 16: [: ce.uml.edu:/users/: integer expression expected
ce.uml.edu:/space/ 36%
./fsc2.sh: line 11: [: ce.uml.edu:/space/: integer expression expected
./fsc2.sh: line 16: [: ce.uml.edu:/space/: integer expression expected

Will quotations around $usage and or the number eliminate these errors?

4 
usage=$(echo "$fsout" | awk '{ print $1 }' | cut -d'%' -f1)

If this is correct ( syntax...), it doesnt make the value an integer... thus the error
e.g. in ksh, I would use let

5

Sure | 'none' | is a valid command?
In lieu of your while read fsout you could read individual variables and get rid of many of your conversions / extractions.
Sure usage is $1 ?

6

I added the let that you suggested and got this:

udev 1%
tmpfs 1%
/dev/dm-0 5%
./fsc.sh: line 9: let: usage=/dev/dm-0: syntax error: operand expected (error token is "/dev/dm-0")
none 0%
none 0%
none 1%
none 1%
/dev/sda1 14%
./fsc.sh: line 9: let: usage=/dev/sda1: syntax error: operand expected (error token is "/dev/sda1")
ce.uml.edu:/users/ 16%
./fsc.sh: line 9: let: usage=ce.uml.edu:/users/: syntax error: invalid arithmetic operator (error token is ".uml.edu:/users/")
ce.uml.edu:/space/ 36%
./fsc.sh: line 9: let: usage=ce.uml.edu:/space/: syntax error: invalid arithmetic operator (error token is ".uml.edu:/space/")

---------- Post updated at 01:50 PM ---------- Previous update was at 01:46 PM ----------

Honestly, not sure of much at this point. I've gone so many different directions with this I don't recall what lead me from one decision to another.

The script currently looks like this

#!/bin/bash
#  script to send an email message to the user specified on the command line if
# any of the file systems at more than 60% of capacity.

df -H | grep -vE '^Filesystem | none' | awk '{ print $1 " " $5 }' | while read -r fsout
do
  echo "$fsout"
  partition=$(echo "$fsout" | awk '{ print $2 }' )
  let usage=$(echo "$fsout" | awk '{ print $1 }' | cut -d'%' -f1)

  if [ "$usage" -ge "90" ]
  then
    echo "CRITICAL WARNING!!: Filesystem \"$partition\" at \"$usage\"% of capacity" | \
    mail -s "CRITICAL WARNING!!: Filesystem \"$partition\" at \"$usage\"% of capacity" emailaddress@student.uml.edu

  elif [ "$usage" -ge "60" ] && [ "$usage" -lt "90" ]
  then
    echo "Warning!!: Filesystem \"$partition\" at \"$usage\"% of capacity" | \
    mail -s "Warning!!: Filesystem \"$partition\" at \"$usage\"% of capacity" emailaddress@student.uml.edu
  fi
done

---------- Post updated at 02:04 PM ---------- Previous update was at 01:50 PM ----------

Thank you! No, usage was not 1, it was two. Working now!

7

Glad our clues helped you out...
Thanks for keeping us informed, and good luck for the future

8

Thank you again for all of your help. I got an A on this assignment. Thank you for pointing me in the right direction!