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Shell Programming and Scripting

Script to mail if files do not exist

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# 1  
Old 04-22-2013
Script to mail if files do not exist
Hi all!

I need some help with a script, but I want to make it better, my script prints the last two files on each directory:
Code:
echo " "
echo "******************* mediation_sgsn:***********************"
ls -lrt /moneta_collected03/mediation_sgsn | tail -2
echo " "
echo "************************* HLR:****************************"
ls -lrt /moneta_collected03/hlr | tail -2
echo " "
echo "*********************** tap_in:***************************"
ls -lrt /moneta_collected02/tap_in | tail -2

But at a certain point if there is no file I want the script to report that there is no file instead of just:
Code:
************************* HLR:****************************
total 0

can I have some help?
# 2  
Old 04-22-2013
Read more about "unix file tests".
# 3  
Old 04-22-2013
If I was looking for a particular file, that could be done by creating a variable with a filename, but in this case these directories hosts a lot of files, and if there are files I need to print the last 2
# 4  
Old 04-22-2013
why not append
Code:
| wc -l

to each line? would give you a count.
Then you could compare if that is at your threshold level.
# 5  
Old 04-22-2013
The requirement is really to print the last two lines with
Code:
ls -lrt

and not really counting files, and if there is no files in it report it
# 6  
Old 04-22-2013
Aren't you trying to see if the count is a zero?
Thus, the result of the command with the '|wc -l' appended will tell you the number of files. Then, you can either:
store that result to a variable and then analyze for >0
or
do all in one command
# 7  
Old 04-22-2013
Code:
function do_one {
  ls -lrt $1 | tail -2 > /tmp/tail.x
  if [ -s /tmp/tail.x ]; then
    echo "No files under this directory"
  else
    cat /tmp/tail.x
  fi
  }

echo " "
echo "******************* mediation_sgsn:***********************"
do_one "/moneta_collected03/mediation_sgsn"
echo " "
echo "************************* HLR:****************************"
do_one "/moneta_collected03/hlr"
echo " "
echo "*********************** tap_in:***************************"
do_one "/moneta_collected02/tap_in"

BTW: The "double quotes" around the directory names are only needed if embedded blanks.
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