topic Re: length of a command string in Operating System - HP-UX

length of a command string

Wen Geng — Tue, 27 Jul 2004 13:51:58 GMT

Is there a length restriction on the command string in HP-UX 11.0 and if there is, what is the max length permitted?

Re: length of a command string

Sundar_7 — Tue, 27 Jul 2004 13:58:22 GMT

getconf LINE_MAX

I do believe this refers to the max length of a command (or a line).

Re: length of a command string

Wen Geng — Tue, 27 Jul 2004 14:05:22 GMT

getconf LINE_MAX returns 2048. My command line lenth is 258 characters and it fails. If I insert the total command in a file and call it, then it runs fine. Any answers?

Re: length of a command string

Sundar_7 — Tue, 27 Jul 2004 14:09:39 GMT

what do you mean when you say "it fails"

What kind of error messages do you see when it fails ?

Re: length of a command string

RAC_1 — Tue, 27 Jul 2004 14:12:02 GMT

I think it is 255. LINE_MAX appies to max line length in a file.

Anil

Re: length of a command string

Ermin Borovac — Tue, 27 Jul 2004 21:43:00 GMT

On 11i system maximum number of characters that can be typed on the shell command line is

255 with posix shell (/usr/bin/sh)
512 with korn shell (/usr/bin/ksh)

I think this limit has something to do with MAX_CANON in /usr/include/limits.h.

# define _POSIX_MAX_CANON 255 /* Max number of bytes in a terminal
# define MAX_CANON 512 /* Max number of bytes in a terminal canonical