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Shell Programming and Scripting

Execute the first line from last

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Top Forums Shell Programming and Scripting Execute the first line from last
# 1  
Old 06-18-2010
Execute the first line from last
Hi,

I have a script xyz.sh and in this, following lines exists.

Code:
#!/bin/bash

./abc.sh PB
sleep 60
./abc.sh RA
sleep 60
./abc.sh GS
sleep 60
./abc.sh S
sleep 60
./abc.sh SI
sleep 60
./abc.sh DR
sleep 12000
./abc.sh CT
sleep 7200
./abc.sh DL
sleep 60
./abc.sh DE
sleep 68400

How to execute the first line " ./abc.sh PB" after last line. It should keep on repeating.
# 2  
Old 06-18-2010
You need a loop. ( this is an infinite loop )

Code:
while :
do
  ##do anything here
done

# 3  
Old 06-18-2010
Code:
(tail -1)

will give u the last line. i am not sure hw can u execute it.
u can use exec command and try executing that way it wil help. and if ur sure the last line has a sleep command then u can do.

Code:
exec `cat xyz.ksh | tail -n`

i am not very familiar with use of exec, just searched it on net. i think this will work. on my system when i execute this command. this is closing my window. so not sure if i m correect or not.

sorry i didnt read the last line.
# 4  
Old 06-18-2010
I should keep on the executing the script.
After sleep 68400, I should again call the ./abc.sh PB and next line and so on.
Execution should be something recursive. How can I do that
# 5  
Old 06-18-2010
As I mentioned,


Code:
#!/bin/bash

while :
do
 ./abc.sh PB
 sleep 60
 ./abc.sh RA
 sleep 60
 ./abc.sh GS
 sleep 60
 ./abc.sh S
 sleep 60
 ./abc.sh SI
 sleep 60
 ./abc.sh DR
 sleep 12000
 ./abc.sh CT
 sleep 7200
 ./abc.sh DL
 sleep 60
 ./abc.sh DE
 sleep 68400
done

# 6  
Old 06-18-2010
then what anchal is saying will work awesomely.

sandy do u wnt to call the same script in cronjob also?
then copy whole of ur script inside the while loop as shown above and it will run for like 4ever unless and untill some1 kills it. or system crashes :P
# 7  
Old 06-18-2010
Hi, I would use cron for that, e.g. (start timees by approximation, first job starting at 01:01 hours):
Code:
echo " 1  1 * * *  /path/to/abc.sh PB
 2  1 * * *  /path/to/abc.sh RA
 3  1 * * *  /path/to/abc.sh GS
 4  1 * * *  /path/to/abc.sh S
 5  1 * * *  /path/to/abc.sh SI
 6  1 * * *  /path/to/abc.sh DR
26  4 * * *  /path/to/abc.sh CT
26  6 * * *  /path/to/abc.sh DL
27  6 * * *  /path/to/abc.sh DE" | crontab

If you are not allowed to use cron, then look into nohup, e.g.:

Code:
nohup /path/to/xyz.sh &

Last edited by Scrutinizer; 06-18-2010 at 08:19 AM..
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