As elixir_sinari and alister pointed out, there are some improvements possible to your command line to get where you want.
Two of the three lines you show in post #1 are error msgs output to stderr. No piped filter will see those unless you redirect stderr.
The grep cmd is pointless. awk can do this.
If you want do stop after the first matched output, you could close the pipe.
Given your post #1 sample, my comments to elixir_sinari's suggestion combined with alister's might do the job:
It will suppress error msgs, print the ifDescr.2500 to the outputfile as desired, and then exit and close the pipe, (hopefully) causing the snmpwalk cmd to terminate. Pls check out and come back with results.
Hi folks,
Please advise which command/command line shall I run;
1) to display the command and its output on console
2) simultaneous to save the command and its output on a file
I tried tee command as follows;
$ ps aux | grep mysql | tee /path/to/output.txt
It displayed the... (7 Replies)
How can I grep exactly a string that has .,/ characters using grep?
Example: I want to grep ONLY string1 and not string1.more or string1.more.evenmore
#lsauth ALL|grep 'string1'
All output:
string1 <--- This is the only I want.
string1.more
string1.evenmore.
more.string1... (4 Replies)
Hi,
I have written a shell script which is a combination of 5 scripts into one.
We have a Record Claim indicator in the scpt ($rc) with which we can come to an conclusion if the script failed to load the data or if the data loaded successfully.
Can any one please help me as to how to... (16 Replies)
I'm working on a script to make backup of various folder located on various host using different OS.
I got a strange behaviour because the script donět process all lines of a configuration file, the script execute only one loop even the input file have 6 lines:
This is the script:
#!/bin/bash... (4 Replies)
This has been bothering me for 3 days.
$> hostname
cepsun64amd
And I just want "cepsun",
I would normally do h=`hostname`; ${h%%64*}
But I am looking for a one-liner just for my own knowledge, because if there is a way to do this, I should know it by now.
Anyway, so is this... (2 Replies)
I am running the export command within a view to use that value inside my build script. But while executing it it is saying "export command not found"
My code is as follows:
--------------------------
#!/bin/sh
user="test"
DIR="/bldtmp/"$user
VIEW="test.view1"
echo "TMPDIR before export... (4 Replies)
Hi All,
I have a file with name
Is there a LINUX command that will help me to output the word after the 9th Underscore(_).
ie the output should be DLY in this case.
Can anybody pls help me.
Thanks much in advance,
Freddie (4 Replies)
below is the output xml string from some other command and i will be parsing it using awk
cat /tmp/alerts.xml
<Alert id="10102" name="APP-DS-ds_ha-140018-componentFailure-S" alertDefinitionId="13982" resourceId="11427" ctime="1359453507621" fixed="false" reason="If Event/Log Level(ANY) and... (2 Replies)
I am using UNIX to create a script on our system. I have setup my commands to append their output to an outage file. However, some of the commands return no output and so I would like something to take their place.
What I need
The following command is placed at the prompt:
TICLI... (4 Replies)
Discussion started by: jbrass
4 Replies
LEARN ABOUT OPENSOLARIS
p2close
p2open(3GEN) String Pattern-Matching Library Functions p2open(3GEN)NAME
p2open, p2close - open, close pipes to and from a command
SYNOPSIS
cc [ flag ... ] file ... -lgen [ library ... ]
#include <libgen.h>
int p2open(const char *cmd, FILE *fp[2]);
int p2close(FILE *fp[2]);
DESCRIPTION
The p2open()gfunction forks and execs a shell running the command line pointed to by cmd. On return, fp[0] points to a FILE pointer to
write the command's standard input and fp[1] points to a FILE pointer to read from the command's standard output. In this way the program
has control over the input and output of the command.
The function returns 0 if successful; otherwise, it returns -1.
The p2close() function is used to close the file pointers that p2open() opened. It waits for the process to terminate and returns the
process status. It returns 0 if successful; otherwise, it returns -1.
RETURN VALUES
A common problem is having too few file descriptors. The p2close() function returns -1 if the two file pointers are not from the same
p2open().
EXAMPLES
Example 1 Example of file descriptors.
#include <stdio.h>
#include <libgen.h>
main(argc,argv)
int argc;
char **argv;
{
FILE *fp[2];
pid_t pid;
char buf[16];
pid=p2open("/usr/bin/cat", fp);
if ( pid == -1 ) {
fprintf(stderr, "p2open failed
");
exit(1);
}
write(fileno(fp[0]),"This is a test
", 16);
if(read(fileno(fp[1]), buf, 16) <=0)
fprintf(stderr, "p2open failed
");
else
write(1, buf, 16);
(void)p2close(fp);
}
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|MT-Level |Unsafe |
+-----------------------------+-----------------------------+
SEE ALSO fclose(3C), popen(3C), setbuf(3C), attributes(5)NOTES
Buffered writes on fp[0] can make it appear that the command is not listening. Judiciously placed fflush() calls or unbuffering fp[0] can
be a big help; see fclose(3C).
Many commands use buffered output when connected to a pipe. That, too, can make it appear as if things are not working.
Usage is not the same as for popen(), although it is closely related.
SunOS 5.11 29 Dec 1996 p2open(3GEN)