Sponsored Content
Top Forums Shell Programming and Scripting Bash shell script undefined array item value question Post 302875243 by lingjing on Tuesday 19th of November 2013 04:30:25 AM
Old 11-19-2013
Question Bash shell script undefined array item value question

Hello,

I'm new here. I test these expressions's value in my script :
(in centOS 6 )
Code:
#!/bin/bash
array['test']='something'

echo "############"
echo ${array["test1"]}
echo ${array["test2"]}
echo ${array["5"]}
echo "############"

The output result is :
Code:
#################
something
something

#################

Why the value of ${array["test1"]} and ${array["test2"]} is "something" instead of empty ?
Because they are not defined just as ${array["5"]}, however the value of ${array["5"]} is empty and it's correct.

Thanks in advance for your help.

Last edited by Franklin52; 11-19-2013 at 05:32 AM.. Reason: Please use code tags
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

BASH shell script question

I want to make shell script that takes a list of host names on my network as command line arguments and displays whether the hosts are up or down, using the ping command to display the status of a host and a for loop to process all the host names. Im new to shell scripting so Im not quite sure... (3 Replies)
Discussion started by: ewarmour
3 Replies

2. Shell Programming and Scripting

find an available item in array

Dear all, I'm have a sorted array like this: 177 220 1001 2000 2001 2003 2005 notice that 2002 and 2004 are NOT in array. Then user input a number INPUT, our script should return OUTPUT value like this: if INPUT is not in array => OUTPUT=INPUT if INPUT is in array => OUTPUT is the... (4 Replies)
Discussion started by: fongthai
4 Replies

3. Shell Programming and Scripting

one question for bash shell script

Just one question for bash shell script. In bash script, you can use *.txt to call any files in current folder that ends with .txt, like rm *.txt will remove all txt file in current folder. My question is can you actually remember or use the file name among *.txt, I know file=*.txt will not... (9 Replies)
Discussion started by: zx1106
9 Replies

4. Shell Programming and Scripting

How do I check using shell-script if an item is available in a database?

Input for the program is a text file consisting of n no. of items. I want search each item in a database and the existing parts should go to FOUND folder and the others should go to NOTFOUND folder. Pls help me in this. Thank u. (1 Reply)
Discussion started by: smarty86
1 Replies

5. Shell Programming and Scripting

Quick question: calling c-shell script from bash

Hello, I have a quick reference question: I have a very long, but fairly straigtforward script written in c-shell. I was wondering if it is possible to call this script from bash (for ex. having a function in bash script which calls the c-shell script when necessary), and if so, are there any... (1 Reply)
Discussion started by: lapiduslost
1 Replies

6. Solaris

bash shell send script question

Hi Experts, Need your help. I am trying to send a command via ssh to about a hundred network devices. I intend to do this via a bash script something similar to the below: ssh -l user testmachine.com "show version" Obviously this will not work given the password prompt that comes... (2 Replies)
Discussion started by: marcusbrutus
2 Replies

7. Shell Programming and Scripting

perl - get uniq item from an array?

practicing perl now and hope to get uniq item from an array: my current work: #!/usr/local/bin/perl my @source = ("aaa", "aaa", "bbb", "ccc", "ddd"); my $index=0; my @uniq; foreach (@source) { chomp; # push first item to @uniq if ($index == 0) { push @uniq, $_; ... (2 Replies)
Discussion started by: tiger2000
2 Replies

8. Ubuntu

error LD: undefined variable while changing shell from bash to csh

Hi, i am a beginner in ubuntu. my default shell is bash. everytime i try to change the shell with command "csh", i get a message (probably an error message). after i get into c-shell, when i try to execute a c shellscript, then it showed the same message. any idea about what is this about or any... (1 Reply)
Discussion started by: Avinash Nayak
1 Replies

9. Shell Programming and Scripting

Associative Array with more than one item per entry

Hi all I have a problem where i have a large list ( up to 1000 of items) and need to have 2 items pulled from it into variables in a bash script my list is like the following and I could have it as an array or possibly an external text file maintained separately. Every line is different and... (6 Replies)
Discussion started by: kcpoole
6 Replies

10. Shell Programming and Scripting

Bash menu item counter

We have a simple menu with prompt of menu numbers to user. It is still under construction. Is there a way to "count" the menu choices so the prompt maximum count can be changed dynamically? See attached TODO note in code read_options(){ local choice # the... (7 Replies)
Discussion started by: annacreek
7 Replies
SCRIPT(1)							   User Commands							 SCRIPT(1)

NAME
script - make typescript of terminal session SYNOPSIS
script [options] [file] DESCRIPTION
script makes a typescript of everything displayed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves the dialogue in this file. If no filename is given, the dialogue is saved in the file type- script. OPTIONS
-a, --append Append the output to file or to typescript, retaining the prior contents. -c, --command command Run the command rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves differently when its stdout is not a tty. -e, --return Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n. -f, --flush Flush output after each write. This is nice for telecooperation: one person does `mkfifo foo; script -f foo', and another can supervise real-time what is being done using `cat foo'. --force Allow the default output destination, i.e. the typescript file, to be a hard or symbolic link. The command will follow a symbolic link. -q, --quiet Be quiet (do not write start and done messages to standard output). -t[file], --timing[=file] Output timing data to standard error, or to file when given. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. -V, --version Display version information and exit. -h, --help Display help text and exit. NOTES
The script ends when the forked shell exits (a control-D for the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. It is not recommended to run script in non-interactive shells. The inner shell of script is always interactive, and this could lead to unexpected results. If you use script in the shell initialization file, you have to avoid entering an infinite loop. You can use for example the .profile file, which is read by login shells only: if test -t 0 ; then script exit fi You should also avoid use of script in command pipes, as script can read more input than you would expect. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1) HISTORY
The script command appeared in 3.0BSD. BUGS
script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. script is primarily designed for interactive terminal sessions. When stdin is not a terminal (for example: echo foo | script), then the session can hang, because the interactive shell within the script session misses EOF and script has no clue when to close the session. See the NOTES section for more information. AVAILABILITY
The script command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils /util-linux/>. util-linux June 2014 SCRIPT(1)
All times are GMT -4. The time now is 08:08 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy