On Feb 4, 2016, at 2:00 PM, Tom Brennan wrote:
That's great stuff, and how mainframe methods need to be taught
today. College students understand unix and windows, and need to
know the (can I say odd?) differences they will see on the
mainframe, along with a bit of history.
I'm currently trying to write up some notes for some (possible) new
mainframers who already know unix, and this is one of my comparisons:
Unix Style:
cat /etc/passwd | grep ^ted013: | awk -F':' '{print $3}'
JCL Style:
//CAT EXEC PGM=CAT
//SYSUT1 DD DSN=SYS1.ETC.PASSWD,DISP=SHR
//SYSUT2 DD DSN=&TEMP1,DISP=(NEW,PASS),SPACE=(CYL,(1,1))
//*
//GREP EXEC PGM=GREP
//SYSUT1 DD DSN=&TEMP1,DISP=(OLD,DELETE)
//SYSUT2 DD DSN=&TEMP2,DISP=(NEW,PASS),SPACE=(CYL,(1,1))
//SYSIN DD *
^ted013:
/*
//AWK EXEC PGM=AWK
//SYSUT1 DD DSN=&TEMP2,DISP=(OLD,DELETE)
//SYSUT2 DD SYSOUT=*
//SYSIN DD *
awk -F':' '{print $3}'
/*
Of course we don't normally have MVS programs named CAT/GREP/AWK
but I'm hoping to show how we chain programs together using JCL,
and relate that to unix commands that a student today already knows
well. Then I just have to try and explain why it takes 16 lines of
JCL to do the same thing as one line in
unix :)-------------------------------------SNIP-----------------
To be fair to zOS There are "probably" the same files needed for UNIX
its just they are "assumed".
Ed
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