mjhjmtu

I have an installation script for my software and I need it to run on both, Linux and AIX.

On Linux I can use a wrapper myinstaller.ksh like this one:

#!/usr/bin/ksh
script -c myrealinstaller.ksh /var/log/myinstaller.log

But on AIX script does not support the -c option.

How can I run my myrealinstaller.ksh inside the forked shell created by script?

You could enhance your wrapper script to detect the OS; if it's running on Linux, execute script -c ..., but if it's running on AIX, give the script-shell an overridden profile that only runs your installer, then exits:

$ cat myinstaller.ksh
#!/usr/bin/ksh

case $(uname -s) in
 (Linux)
 script -c myrealinstaller.ksh /var/log/myinstaller.log
 ;;
 (AIX)
 printf "ENV= ./myrealinstaller.kshnexitn" > ./installer.profile
 trap 'rm -f ./installer.profile' INT
 ENV=./installer.profile script -q ./var/log/myinstaller.log
 rm ./installer.profile
 ;;
esac

I adjusted the paths to the script and logs to test it locally. The other factors involved are:

• setting ENV to point to the overridden profile as we call script
  


• calling script with -q to quiet it down a bit


• importantly, unsetting ENV during the call to the real installer, so that we don't loop infinitely


• telling the overridden profile to exit as soon as the installer is done

With a sample myrealinstaller.ksh of:

#!/bin/ksh
echo Hi, I am the real installer

The contents of ./var/log/myinstaller.log are:

Script command is started on Thu Mar 15 09:34:04 2018.
Hi, I am the real installer


Script command is complete on Thu Mar 15 09:34:04 2018.