Executing command remotely on another linux server from a shell script

Question

I have a shell-script which extract details from a log file between two dates and executes a command on the output to generate some report. The log files are on different server and scripts are executed on different server. the Script looks like :

#!/bin/sh
time1=$1
time2=$2
echo `ssh -i key  user@ip -yes cat file | awk '{if(substr($4,2)>="'$time1'" && substr($4,2)<="'$time2'") print $0;}'` > tmp.log

`cat tmp.log | some operation to get detail`

The output expected to be in multiple lines like :

ip1 date1 - - request1 file1 method1 status1 
ip2 date2 - - request2 file2 method2 status2

But the output generated (by my command) is getting concatenated into a single line, containing all the details, like:

 ip1 date1 - - request1 file1 method1 status1 ip2 date2 - - request2 file2 method2 status2

When the command is executed directly on the server it generates desired output but not when executed remotely.
So my question is how would I get the correct output and is this a good way to do it ?

The echo in backticks is not only silly, but wrong. Simply replace echo `whatever` with whatever. See also porkmail.org/era/unix/award.html#echo — tripleee
– tripleee, Commented Feb 23, 2015 at 9:18
Thank you I got it backticks neglects \n. so what I did is added the command inside " ".Like this : echo "`command`" — anand
– anand, Commented Feb 23, 2015 at 9:55

Peter Bowers · Accepted Answer · 2015-02-23 10:18:26Z

2

From your comments above you are still using "echo". @tripleee is correct. Don't. Also don't use the pointless cat at the start - simply redirect std in to your next command.

#!/bin/sh
time1=$1
time2=$2
ssh -i key  user@ip -yes cat file | awk '{if(substr($4,2)>="'$time1'" && substr($4,2)<="'$time2'") print $0;}' > tmp.log

some operation to get detail <tmp.log

answered Feb 23, 2015 at 10:18

Peter Bowers

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