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Using sed and if multiple conditions

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Top Forums Shell Programming and Scripting Using sed and if multiple conditions
# 8  
Old 07-19-2014
Strange. If i dont use the -o it just doesnt work. Its been a really long time since i had to use -o i forgot about that option
# 9  
Old 07-19-2014
Why would that break old scripts ? -a and -o will most likely remain supported by the implementations ...

Obsolescent means that is has become outdated and its usage is discouraged, for the reasons given and there is the intention to remove it from the standard..

Quote:
Q15. Does removal of obsolescent utility syntax mean that implementations supporting usages of head -5 file, tail -5 file, tail -l file are no longer allowed?

No, in general the intent of removing the obsolescent forms of the utility synopses was not to disallow them to be supported by implementations but to downgrade the status of their use in applications from conforming application using an obsolescent feature to non-conforming application. In general it is allowed for utilities to have extensions that violate the utility syntax guidelines so long as the forms defined in the standard that are required to follow the utility syntax guidelines do so. The cases cited fit the case. The Austin Group has more general cases under review at the present time.
POSIX.1 FAQ

---

Quote:
Originally Posted by techy1
Strange. If i dont use the -o it just doesnt work. Its been a really long time since i had to use -o i forgot about that option
What version of ksh are you using on what OS? Even though older implementations are not POSIX compliant, they should support that syntax..
Last edited by Scrutinizer; 07-19-2014 at 08:41 AM..
# 10  
Old 07-19-2014
Quote:
Originally Posted by Scrutinizer
Why would that break old scripts ? -a and -o will most likely remain supported by the implementations ...

Obsolescent means that is has become outdated and its usage is discouraged, for the reasons given and there is the intention to remove it from the standard..



POSIX.1 FAQ

---



What version of ksh are you using on what OS? Even though older implementations are not POSIX compliant, they should support that syntax..
I don't understand it myself. I just ran it on my Linux system at home and works fine.

The one I need it for is using AIX.
Code:
ksh version Version M-11/16/88f

Code:
I just looked up the version as well:

88f   
 Version M-11/16/88f-beta4     IRIX 5.3-6.3    
 Version 11/16/88f   IRIX 6.3+   
 
 Version M-11/16/88f  OSF1/V4+ 
 AIX 4.3.*, AIX 5.1-3 
 IRIX-6.5.5 
 HP-UX 10,11 /usr/bin/sh   


In the HP-UX 11 /bin/sh the undocumented flag "Q" disables reading of $ENV at startup.

# 11  
Old 07-19-2014
I just tried it with Version M-11/16/88f on AIX and it works fine..

Code:
$ [ -z "$EXP" ] || [ "$EXP" = "none" ] && echo hllo
hllo
$ EXP=
$ [ -z "$EXP" ] || [ "$EXP" = "none" ] && echo hllo
hllo
$ EXP=none 
$ [ -z "$EXP" ] || [ "$EXP" = "none" ] && echo hllo
hllo
$ EXP=foo
$ [ -z "$EXP" ] || [ "$EXP" = "none" ] && echo hllo     
$

Can you post the result that you get?
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