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Ksh Features That Are Obsolete in Ksh93
1. Using a pair of grave accents ` ... ` for command
substition. Use $( ... ) instead.
2. FCEDIT is an obsolete name for the default editor name
for the hist command. FCEDIT is not used when
HISTEDIT is set. Use HISTEDIT instead.
3. The newtest ([[ ... ]]) operator -a file is obsolete.
Use -e instead.
4. The newtest ([[ ... ]]) operator =, as used in string
= pattern is obsolete. Use == instead.
5. The following obsolete arithmetic comparisons are also
permitted:
exp1 -eq exp2 True, if exp1 is equal to
exp2.
exp1 -ne exp2 True, if exp1 is not equal to
exp2.
exp1 -lt exp2 True, if exp1 is less than
exp2.
exp1 -gt exp2 True, if exp1 is greater than
exp2.
exp1 -le exp2 True, if exp1 is less than or
equal to exp2.
exp1 -ge exp2 True, if exp1 is greater than
or equal to exp2.
6. Using test -t or [ -t ] without specifying the file
unit number.
7. The -k option to the set builtin is obsolete. It
causes all variable assignment arguments are placed in
the environment, even if they occur after the command
name. The following first prints a=b c and then c:
There is no alternative.
8. The obsolete -xf option of the typeset command allows
a function to be exported to scripts that are executed
without a separate invocation of the shell. Functions
that need to be defined across separate invocations of
the shell should be placed in a directory and the
FPATH variable should contains the name of this
directory. They may also be specified in the ENV file
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with the -xf option of typeset.
9. The shell environment variable FCEDIT is obsolete.
Use HISTEDIT instead.
10. In the -s option (to fc or hist command???) ( and in
obsolete versions, the editor name - ) is used to skip
the editing phase and to re-execute the command.
11. The -t option to alias builtin is is obsolete. It is
used to set and list tracked aliases. There is no
replacement.
12. The shell command line option -t is obsolete. This
option cause the shell to exit after reading and
executing one command. The is no replacement
(although ending "command" with the exit builtin
should have the same effect).
13. As an obsolete feature of the "set" builtin, if the
first arg is - then the -x and -v options are turned
off and the next arg is treated as the first argument.
Using + rather than - causes these options to be
turned off. These options can also be used upon
invocation of the shell.
