I was skimming through an /etc/rc.d/init.d/sendmail file (I know this is hardly ever used, but I’m studying for an exam), and I’ve become a bit confused about the && and the || operators. I’ve read where they can be used in statements such as:
The unix sysadmin where I’m working is reluctant to give me access to change my login shell from ksh to bash. He has given various excuses, the funniest being that since they write all their scripts for ksh they won’t work if I try to run them. I don’t know where he gets these ideas, but since I can’t convince him, is there any alternative that I have?
I tried to check if the PHONE_TYPE variable contains one of three valid values.
I wish to use shell to invoke a script on a remote server.
I would like to capture the output of that script (its logging messages) and the exit code it returns.
I’ve read this question and answer, but it doesn’t quit fit my problem, even tho it’s similar.
I’m getting confused about the role word splitting plays in zsh. I have not been exposed to this concept when programming in C, Python or MATLAB, and this has triggered my interest of why word splitting seems to be something specific to shell programming.
Given the following command:
Suppose I have a file (call it sample.txt) that looks like this:
I’ve seen the questions and answers about needing to double-escape the arguments to remote ssh commands. My question is: Exactly where and when does the second parsing get done?
Is there any tool in Solaris UNIX (so no GNU tool available) to subtract dates? I know that in Linux we have gawk that can subtract one date from another. But in Solaris the maximum we have is nawk (improved awk) which cannot perform date calculations. Also I cannot use perl.