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Old 08-06-2014, 02:01 AM   #1
ganesan_p
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Question how to write timer shell script?


hi,

i am checking filesystem using chkfsys utility . this utility return zero(0) if filesystem is good. sometimes chis utility taking more time if error occured in filesystem .

so i have to check filesystem. if it will return the value less then 5 sec i have to return 0 else return 1.
i have to write this in shell script please help me .

regards,
ganesan.
 
Old 08-06-2014, 02:14 AM   #2
cliffordw
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Hi,

I'm not sure that I agree with the reasoning that because a command is taking long there must be a problem with the filesystem, but don't know enough about what you're doing to really form an opinion about that.

Regarding how to time a command and return a value based on that, something like this should do:

Code:
#!/bin/bash
## time a command
# Remember start time
starttime=$(date +"%s")
# Place your command here, instead of my "sleep" command
sleep 1
# Remember end time
endtime=$(date +"%s")
# Calculate elapsed time
(( elapsed = endtime - starttime ))
# Display result - for debugging - optional
echo $elapsed
# Return exit status depending on time
if [ $elapsed -lt 5 ]
then
        exit 0
else
        exit 1
fi
Good luck!
 
Old 08-06-2014, 02:21 AM   #3
evo2
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Hi,

you might be able to use the "time" command for this. For example something like
Code:
#!/bin/bash

# Don't use shell built in time, because we want to format the output
# Redirection gymnastics because the output is to stderr
tfloat=$(/usr/bin/time -f %e chkfsys 2 2>&1)

# Strip off the decimal part so we can use integer comparison
tint=${tfloat%.*}

# Do the comparison
if [ $tint -lt 5 ] ; then
  exit 0
fi
exit 1
HTH,

Evo2.
 
Old 08-06-2014, 02:32 AM   #4
ganesan_p
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thanks for reply,

but chkfsys utility taking more time it won't end (because it is asking user input). we have to kill stop that process it its taking more time

regards,
ganesan.
 
Old 08-06-2014, 02:38 AM   #5
evo2
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Hi,

ok, how about something like
Code:
#!/bin/bash
chkfsys &

sleep 5

pkill chksfys
if [ "$?" = "0" ] ; then # chksys was killed
  exit 1
fi
exit 0
Note that this will kill all running chkfsys processes that the user has permission to. Also note, that like cliffordw, I really wonder if you are using the right approach here.

Evo2.


Evo2.
 
Old 08-06-2014, 02:54 AM   #6
pan64
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you need to start two processes, the first one will run chkfsys and the second one will kill it after the specified timeout. but actually it has no meaning, if chkfsys waits for user input it will fail anyway (because you will kill it)....
 
Old 08-06-2014, 04:55 AM   #7
ganesan_p
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thanks for your reply,

actually i have four partition in my CF(hd0t77,78,79,8) . filesystem corrupted may happen any partition. i have to check the all partitions . i checked the 4 partition first two partitions filesystems are good .third partitions is problem .so i have to find which partitions is good ,which partition is bad.

regards,
ganesan
 
Old 08-06-2014, 09:48 AM   #8
TB0ne
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Quote:
Originally Posted by ganesan_p View Post
thanks for your reply,

actually i have four partition in my CF(hd0t77,78,79,8) . filesystem corrupted may happen any partition. i have to check the all partitions . i checked the 4 partition first two partitions filesystems are good .third partitions is problem .so i have to find which partitions is good ,which partition is bad.
Ok...so show us what YOU Have written/tried to fix this problem. So far, you've had others write your script for you, and shown no effort of your own.
 
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