You are right. Most shells (with the notable exception of ksh93) only have integers as a data type but not floats. Therefore "0.0" is interpreted as a string but -gt (and similar operands like -ge, -eq, -lt, -le) expects integers and nothing else. i.e test 0 -eq abc will lead to the same error.

The first thing i see is the missing shebang: do yourself a favour ad explicitly state the shell you want to run this script. Otherwise you will eventually get disappointed.

Second, the ps command seems not to do what you probably intend it to do. ps -uax displays all processes run by a user named "ax". Notice that there is a difference between BSD-style ps and UNIX-SystemV (or POSIX-) style ps. Most implementations understand both sorts of syntax and because in BSD the ps-options were not introduced by dashes if you use dashes the options are interpreted in POSIX-syntax and if you don't they are interpreted in BSD-style. i.e:

Code:

ps aux     # BSD-style with options "a" (all processes), "u" (user-oriented format) and "x" (also processes without a tty)
ps -aux    # POSIX-style with options "-a" (all processes except session leaders and processes without a tty) and
           # -u <username>, since "-u" expects a user name "x" is interpreted as this

Note that some versions of ps, when no user named "x" exists, second-guess the intention and execute as they had been called like ps aux instead. Needless to say that one better not relies on such if i say a you will do as if i had said b because in reality i might mean c ... tactics.

With the correct syntax, though, you could also get rid of the

Code:

| grep zoltan

i.e by using -U <user>.

I hope this helps.

bakunin