Guys,
I'm using
gawk 4.1.3 under HP-UX 11.31 (POSIX shell) and I wonder if I'm missing something.
The shell fragment
exec 9<&1
ls –l | gawk '{ print >"/dev/fd/9" }'
is intended to send its output to fd 9, dup'ed from stdout. Yet I get
gawk: cmd. line:2: (FILENAME=- FNR=1) fatal: can't redirect to `/dev/fd/9' (No such file or directory)
Using lsof to see what the child process has available:
bnetst03:/tmp # cat x
exec 9<&1
ls -l | gawk '
BEGIN { system( "lsof -p " PROCINFO["pid"] ) }
{ print $0 >"/dev/fd/9" }'
bnetst03:/tmp # ./x
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
gawk 13565 root cwd DIR 64,0x6 8192 2 /tmp
gawk 13565 root txt REG 64,0x7 1740108 16209 /usr/local/bin/gawk
gawk 13565 root mem REG 64,0x7 5026568 13064 /usr/lib/hpux32/libc.so.1
gawk 13565 root mem REG 64,0x7 6357576 42868 /usr/lib/hpux32/libm.so.1
gawk 13565 root mem REG 64,0x7 191412 42988 /usr/lib/hpux32/uld.so
gawk 13565 root mem REG 64,0x7 76736 42986 /usr/lib/hpux32/libdl.so.1
gawk 13565 root mem REG 64,0x7 1170156 42985 /usr/lib/hpux32/dld.so
gawk 13565 root 0r FIFO 0xe00000054d5ce888 0t0 540953
gawk 13565 root 1u STR 157,0x1 0t29131 696 /dev/pts/1->ldterm->ptem->pts
gawk 13565 root 2u STR 157,0x1 0t29131 696 /dev/pts/1->ldterm->ptem->pts
gawk: cmd. line:3: (FILENAME=- FNR=1) fatal: can't redirect to `/dev/fd/9' (No such file or directory)
bnetst03:/tmp #
it seems that fd 9, which should have been inherited, is not picked up at all.
Now this script actually works under Cygwin (awk 4.1.0) and RHEL (bash 3.0.15,
awk 3.1.3). Moreover, the HP POSIX shell itself seems to quite happily pass descriptors to child shells:
bnetst03:/tmp # cat x
exec 9<&1
ls -l | ./x2
bnetst03:/tmp # cat x2
cat >&9
bnetst03:/tmp # ./x
total 64
drwxrwxrwx 2 root sys 96 Oct 16 14:07 !p4.d
drwx------ 2 root root 96 Oct 13 08:41 .AgentSockets
-rw-rw-rw- 1 root sys 128 Oct 13 14:35 .kc.trace
drwx------ 2 root root 96 Oct 13 08:52 .mcsg
srwxrwxrwx 1 sfmdb users 0 Nov 2 15:34 .s.PGSQL.10864
-rw------- 1 sfmdb users 27 Nov 2 15:34 .s.PGSQL.10864.lock
drwx------ 2 root sys 96 Oct 20 14:34 d
-rw-r--r-- 1 root root 0 Oct 13 08:41 ipv6agt.crashlog
-r--r--r-- 1 root root 0 Oct 13 08:41 llbdbase.dat
drwxr-xr-x 2 root root 96 Nov 11 2013 lost+found
-rwx------ 1 root sys 113 Nov 2 16:13 x
-rwx------ 1 root sys 8 Nov 2 15:55 x2
bnetst03:/tmp #
Is there something Not Quite Right with the HP-UX build of gawk ?
Thanks.
Rocket J. Squirrel: "... we're
going to have to think!"
Bullwinkle J. Moose: "There
must be an easier way than that."
HOWARD BRYDEN
Senior Unix Administrator
Infrastructure Support
Public Safety Business Agency
PHONE: 07 3635 3087
POSTAL: GPO Box 1425, Brisbane,
QLD 4001 |
EMAIL: address@hidden
This correspondence is for the named persons only. It may contain confidential or privileged information or both. No confidentiality or privilege is waived or lost by any mis transmission. If you receive this correspondence in error please delete it from your system immediately and notify the sender. You must not disclose, copy or relay on any part of this correspondence, if you are not the intended recipient. Any opinions expressed in this message are those of the individual sender except where the sender expressly, and with the authority, states them to be the opinions of the Queensland Government.