Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Explanation on problem "match" function awk Post 302812303 by RudiC on Saturday 25th of May 2013 04:54:01 PM
Old 05-25-2013
Hmmmm - the requestor didn't ask for alternative solutions, he asked to explain why that "strange" behaviour occurred (which, btw, is not strange but correct). Let's go and try: According to the gawk man page, the array f will be filled with "the matches". The first match ( f[1] ) is being used as a separator in the following split, and then the chars before the first match (array[1]) will be substituted with "".
If there's no match, like in the second line, f will be empty, and split will use an empty separator, resulting in a per char split. array[1] will then hold the "S" which will be removed.
Logical, understandable?
 

10 More Discussions You Might Find Interesting

1. Programming

How to convert the "select" function into a "poll" function

i have a program using the select function but i want to convert it to poll... how can i do this? thanks in advance... :) (1 Reply)
Discussion started by: rbolante
1 Replies

2. UNIX for Dummies Questions & Answers

Explain the line "mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'`"

Hi Friends, Can any of you explain me about the below line of code? mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'` Im not able to understand, what exactly it is doing :confused: Any help would be useful for me. Lokesha (4 Replies)
Discussion started by: Lokesha
4 Replies

3. HP-UX

ERROR: more than one instance of overloaded function "vprintf" has "C" linkage

Hi people! I've got this own library: -------------------------------------------- Personal.h -------------------------------------------- #ifdef __cplusplus extern "C" { #endif #include <stdio.h> #include <stdarg.h> #include <string.h> ... (0 Replies)
Discussion started by: donatoll
0 Replies

4. Shell Programming and Scripting

cat $como_file | awk /^~/'{print $1","$2","$3","$4}' | sed -e 's/~//g'

hi All, cat file_name | awk /^~/'{print $1","$2","$3","$4}' | sed -e 's/~//g' Can this be done by using sed or awk alone (4 Replies)
Discussion started by: harshakusam
4 Replies

5. Shell Programming and Scripting

awk statement to match all lines starting with "#"

Looking for awk statement that will match all lines starting with "# " if ( $1 == \^"#" ) Input file: # of the server. If you would like to set these, please take out the # pound (#) sign in front of one or all severities and set it equal to # severity desired. For example, FATAL=3 #... (2 Replies)
Discussion started by: Arsenalman
2 Replies

6. UNIX for Dummies Questions & Answers

Explanation of "total" field in "ls -l" command output

When I do a listing in one particular directory (ls -al) I get: total 43456 drwxrwxrwx 2 root root 4096 drwxrwxrwx 3 root root 4096 -rwxrwxr-x 1 nobody nobody 3701594 -rwxrwxr-x 1 nobody nobody 3108510 -rwxrwxr-x 1 nobody nobody 3070580 -rwxrwxr-x 1 nobody nobody 3099733 -rwxrwxr-x 1... (1 Reply)
Discussion started by: proactiveaditya
1 Replies

7. Shell Programming and Scripting

awk command to replace ";" with "|" and ""|" at diferent places in line of file

Hi, I have line in input file as below: 3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL My expected output for line in the file must be : "1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL" Can someone... (7 Replies)
Discussion started by: shis100
7 Replies

8. Shell Programming and Scripting

how to use "cut" or "awk" or "sed" to remove a string

logs: "/home/abc/public_html/index.php" "/home/abc/public_html/index.php" "/home/xyz/public_html/index.php" "/home/xyz/public_html/index.php" "/home/xyz/public_html/index.php" how to use "cut" or "awk" or "sed" to get the following result: abc abc xyz xyz xyz (8 Replies)
Discussion started by: timmywong
8 Replies

9. UNIX for Advanced & Expert Users

AIX - io info get from "libperfstat" not match "iostat"

Hi, everyone. I need to write a program to get io info based on libperfstat. But the "write time" of a disk is just half of the value get from iostat. I'm confused and can't explain. Help please. How I calculate "write service time per sec": In iostat: write service... (0 Replies)
Discussion started by: jackliang
0 Replies

10. Shell Programming and Scripting

Search file containing ps results for a match "my.cnf" and then for a second match . "ok:" and

I need to find two matches in the output from ps. I am searching with ps -ef |grep mysql for: my.cnf /bin/sh /usr/bin/mysqld_safe --defaults-file=/data/mysql/master/agis_core/etc/my.cnf after this match I want to search back and match the hostname which is x number of lines back, above the... (2 Replies)
Discussion started by: bash_in_my_head
2 Replies
EXPECT_EXPECTL(3)							 1							 EXPECT_EXPECTL(3)

expect_expectl - Waits until the output from a process matches one of the patterns, a specified time period has passed, or anEOFis seen

SYNOPSIS
int expect_expectl (resource $expect, array $cases, [array &$match]) DESCRIPTION
Waits until the output from a process matches one of the patterns, a specified time period has passed, or an EOF is seen. If $match is provided, then it is filled with the result of search. The matched string can be found in $match[0]. The match substrings (according to the parentheses) in the original pattern can be found in $match[1], $match[2], and so on, up to $match[9] (the limitation of libexpect). PARAMETERS
o $expect - An Expect stream, previously opened with expect_popen(3). o $cases - An array of expect cases. Each expect case is an indexed array, as described in the following table: Expect Case Array +----------+--------------------------+---+---+---+ |Index Key | | | | | | | | | | | | | Value Type | | | | | | | | | | | | Description | | | | | | | | | | | | Is Mandatory | | | | | | | | | | | | Default Value | | | | | | | | | | +----------+--------------------------+---+---+---+ | 0 | | | | | | | | | | | | | string | | | | | | | | | | | | pattern, that will be | | | | | | matched against the out- | | | | | | put from the stream | | | | | | | | | | | | yes | | | | | | | | | | | | | | | | | | T{ 1 | | | | | | | | | | | | mixed | | | | | | | | | | | | value, that will be | | | | | | returned by this func- | | | | | | tion, if the pattern | | | | | | matches | | | | | | | | | | | | yes | | | | | | | | | | | | | | | | | | T{ 2 | | | | | | | | | | | | integer | | | | | | | | | | | | pattern type, one of: | | | | | | EXP_GLOB, EXP_EXACT or | | | | | | EXP_REGEXP | | | | | | | | | | | | no | | | | | | | | | | | | | | | | | | EXP_GLOB | | | | | | | | | | +----------+--------------------------+---+---+---+ RETURN VALUES
Returns value associated with the pattern that was matched. On failure this function returns: EXP_EOF, EXP_TIMEOUT or EXP_FULLBUFFER CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 0.2.1 | | | | | | | Prior to version 0.2.1, in $match parameter a | | | match string was returned, not an array of match | | | substrings. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 expect_expectl(3) example <?php // Copies file from remote host: ini_set("expect.timeout", 30); $stream = fopen("expect://scp user@remotehost:/var/log/messages /home/user/messages.txt", "r"); $cases = array( // array(pattern, value to return if pattern matched) array("password:", "asked for password"), array("yes/no)?", "asked for yes/no") ); while (true) { switch (expect_expectl($stream, $cases)) { case "asked for password": fwrite($stream, "my password "); break; case "asked for yes/no": fwrite($stream, "yes "); break; case EXP_TIMEOUT: case EXP_EOF: break 2; // break both the switch statement and the while loop default: die "Error has occurred!"; } } fclose($stream); ?> SEE ALSO
expect_popen(3). PHP Documentation Group EXPECT_EXPECTL(3)
All times are GMT -4. The time now is 10:25 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy