issue 1: when ktab should work fine if it include -a and -d option in the same command. Current implementation does not take care of them. For example

ktab -l -a dummy2 bogus -d dummy1 -k FILE:/home/lw129730/mykrb5tab

The above command should add dummy2 and delete dummy1. Current implementation just does one of them, deleting dummy1. The result can be observed in the follow.

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lwang:/home/lw129730/Kerberos( 168 )%klist -c -k -K FILE:/home/lw129730/mykrb5tab

Key tab: FILE:/home/lw129730/mykrb5tab, 2 entries found.

[1] Service principal: ###@###.###
         KVNO: 1
         Key: 0x2022398269baddf
[2] Service principal: ###@###.###
         KVNO: 1
         Key: 0x5e9e3132baece991
lwang:/home/lw129730/Kerberos( 169 )%ktab -l -a dummy2 bogus -d dummy1 -k FILE:/home/lw129730/mykrb5tab
Are you sure you want to delete service key for ###@###.### in /home/lw129730/mykrb5tab?(Y/N) :y
Done!
lwang:/home/lw129730/Kerberos( 170 )%klist -c -k -K FILE:/home/lw129730/mykrb5tab

Key tab: FILE:/home/lw129730/mykrb5tab, 1 entry found.

[1] Service principal: ###@###.###
         KVNO: 1
         Key: 0x2022398269baddf
lwang:/home/lw129730/Kerberos( 171 )%which ktab
/net/luster/export/scratch/jsn_re/jdk/jdk1.4.1/ws/build/solaris-sparc/bin/ktab
lwang:/home/lw129730/Kerberos( 172 )%which klist
/net/luster/export/scratch/jsn_re/jdk/jdk1.4.1/ws/build/solaris-sparc/bin/klist
lwang:/home/lw129730/Kerberos( 173 )%
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issue 2: Since all parameters "-l -a -d -k" are case-insensitive, specification should mention it.