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Shell Programming and Scripting
Pause for response from the log file
Post 302250839 by gxdanh on Friday 24th of October 2008 11:52:31 AM
10-24-2008
hello everyone,
I am able to go further with getline from exact terminal device.
From my UNIX prompt, my terminal device is /dev/pts/26.
$ > tty
/dev/pts/26
$ >
So, I changed the getline command as below:
tail -f log.file |nawk '
{print $0}
$0 ~ /error/ {
print "Error found. Press ENTER to acknowledge."
getline i < "/dev/pts/26"
}
$0 ~ /aborted/ {
print "Error found. Press ENTER to acknowledge."
getline i < "-"
}
'
It paused and wait for acknowledgement. But ...
How can I get current terminal device into my nawk? each time I log in, I will get diff. terminal device.
I tried the following but all fail:
=1= Begin stmt
BEGIN {dev = ENVIRON["$devID"]}
. . .
getline i < "$dev"
note: I export tty value prior nawk stmt (export devID=`tty`)
=2= and ...
getline i < system ("echo $devID")
getline i < system ("echo `tty`")
getline i < "ENVIRON["$devID"]"
None of them seem to work for me.
when I tried the command below,
getline i < "/dev/tty"
It works most of the time.
Once in a while, it failed too.
Please help.
Thanks
George
I am able to go further with getline from exact terminal device.
From my UNIX prompt, my terminal device is /dev/pts/26.
$ > tty
/dev/pts/26
$ >
So, I changed the getline command as below:
tail -f log.file |nawk '
{print $0}
$0 ~ /error/ {
print "Error found. Press ENTER to acknowledge."
getline i < "/dev/pts/26"
}
$0 ~ /aborted/ {
print "Error found. Press ENTER to acknowledge."
getline i < "-"
}
'
It paused and wait for acknowledgement. But ...
How can I get current terminal device into my nawk? each time I log in, I will get diff. terminal device.
I tried the following but all fail:
=1= Begin stmt
BEGIN {dev = ENVIRON["$devID"]}
. . .
getline i < "$dev"
note: I export tty value prior nawk stmt (export devID=`tty`)
=2= and ...
getline i < system ("echo $devID")
getline i < system ("echo `tty`")
getline i < "ENVIRON["$devID"]"
None of them seem to work for me.
when I tried the command below,
getline i < "/dev/tty"
It works most of the time.
Once in a while, it failed too.Please help.
Thanks
George
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LEARN ABOUT POSIX
pty
PTY(4) BSD Kernel Interfaces Manual PTY(4) NAME
pty -- BSD-style compatibility pseudo-terminal driver SYNOPSIS
device pty DESCRIPTION
The pty driver provides support for the traditional BSD naming scheme that was used for accessing pseudo-terminals. When the device /dev/ptyXX is being opened, a new terminal shall be created with the pts(4) driver. A device node for this terminal shall be created, which has the name /dev/ttyXX. New code should not try to allocate pseudo-terminals using this interface. It is only provided for compatibility with older C libraries that tried to open such devices when posix_openpt(2) was being called. FILES
The BSD-style compatibility pseudo-terminal driver uses the following device names: /dev/pty[l-sL-S][0-9a-v] Pseudo-terminal master devices. /dev/tty[l-sL-S][0-9a-v] Pseudo-terminal slave devices. DIAGNOSTICS
None. SEE ALSO
posix_openpt(2), pts(4), tty(4) HISTORY
A pseudo-terminal driver appeared in 4.2BSD. BUGS
Unlike previous implementations, the master slave device nodes are destroyed when the PTY becomes unused. A call to stat(2) on a nonexistent master device will already cause a new master device node to be created. The master device can only be destroyed by opening and closing it. The pty driver cannot be unloaded, because it cannot determine if it is being used. BSD
August 20, 2008 BSD