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Bash to ksh problem

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# 1  
Old 01-20-2013
Bash to ksh problem

Hi all

Below code works in bash but it is not working in ksh.

enddate=`date -d "$enddate + $i day" "+%Y_%m_%d"`

Please help me how it works in ksh


Last edited by pmreddy; 01-21-2013 at 05:50 AM..
# 2  
Old 01-20-2013
Replace shebang #!/bin/bash to #!/bin/ksh -xv (set xtrace & verbose) and run the code to reveal lines that are not KSH compliant.

For example, I see you are using string search and replace which I guess is not supported in KSH.
startdate="${1//_/-}"  # change underscores into dashes

Use sed instead to perform search and replace.
# 3  
Old 01-20-2013
Originally Posted by bipinajith
For example, I see you are using string search and replace which I guess is not supported in KSH.
ksh does support it. But only ksh93 versions.

@OP: Which ksh version are you using? Are you running this on some machine not having GNU date installed?
# 4  
Old 01-20-2013
I'd also replace the "echo"s with "print"s. "print" is a built-in command in ksh, while "echo" isn't.

What is equally ugly in ksh and in bash is this:

while [ 1 ]

It will work, but will use "test" to do so. Instead

while :

will do the same with less resources used.

I hope this helps.

# 5  
Old 01-20-2013
@Bakunin, can you site a version of ksh where echo is not builtin?

I have 11/16/88, 12/28/93 and mksh 41 and it appears to be builtin in all of these.
# 6  
Old 01-20-2013
It might be built in but this is not required by the standard. The standard output command in ksh is "print" and if you use "echo" the shell executes "/bin/echo" if it is not built in. In the AIX ksh (a ksh88) this used to be so, but to be honest i haven't checked that lately.

This User Gave Thanks to bakunin For This Post:
# 7  
Old 01-20-2013
Thanks, that might explain why a lot of the old AIX ksh scripts we have around here use print (I've always replaced them with echo or printf, whenever making updates - just because it's more portable).

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