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Legal and illegal bash variable names?
Post 302894457 by renegade755 on Tuesday 25th of March 2014 02:19:28 PM
03-25-2014
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1. Shell Programming and Scripting
Hi
I have several variables called
var1, var2, var3, var4 and so on.
I would like to examine the contents of the variables using a loop
and a variable called num which equals a figure
eg
num=3
I wanted to do something like
echo $var$num
to display the contents of var3 (4 Replies)
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Hi,
I have a variable v_iteration which can equal any 3 digit number eg 001 or 926
I would like to dynamically make a new variable name up using this 3 digit number
eg
v_another_variable_001=fred
v_another_variable_926=joe
The following are examples of what I have tried
... (2 Replies)
Discussion started by: Bab00shka
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Hi Everyone,
I was just curious if you are allowed to begin a variable name with a number. For example, I would really like to have the variable 8DAY_AVERAGE. But my shell script only seems to allow EIGHTDAY_AVERAGE. Is there a way I can get the former to work? I am using bash. Thanks a lot!
... (1 Reply)
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Hi,
I am using BASH. I have encountered a situation where the following is necessary (but I am not sure how to do it):
#Define multiple arrays, whose names only differ by a number:
ARRAY_1=(1 2 3)
ARRAY_2=(4 5 6)
ARRAY_3=(7 8 9)
#Define ARRAY_AMOUNT, the number of arrays. In this case... (1 Reply)
Discussion started by: msb65
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5. Shell Programming and Scripting
Hi all,
I make this bash script in which there is one option to add a name in txt file. So when I run the script it ask me for the name. When i enter the name, that name gets added in a txt file. If i add the same name again, the message comes up, the name is already there
My question is..... (2 Replies)
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6. Shell Programming and Scripting
Hello group,
Still fairly new at the whole scripting thing so be gentle. I'm trying to write a simple script that archives my log files into a master log broken into weeks of the year.
My script runs fine up till the "cat" lines which I get a undefined or illegal variable name error. But... (2 Replies)
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I am trying to declare a variable like this
#!/bin/csh -f
set c_arg = $a $b $c
However, since i need it to declare before declaring $a ,$b or $c.
As of now i am getting an error which says $a not defined.
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8. Shell Programming and Scripting
Simple enough problem I think, I just can't seem to get it right.
The below doesn't work as intended, it's just a function defined in a much larger script:
CheckValues() {
for field in \
Group_ID \
Group_Title \
Rule_ID \
Rule_Severity \
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Hi All
I think I might have bitten off more than I can chew here and I'm hoping some of you guys with advanced pattern matching skills can help me.
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As part of a bash the below line strips off a numerical prefix from directory 1 to search for in directory 2.
for file in /home/cmccabe/Desktop/comparison/missing/*.txt
do
file1=${file##*/} # Strip off directory
getprefix=${file1%%_*.txt}
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LEARN ABOUT PHP
dba_open
DBA_OPEN(3) 1 DBA_OPEN(3) dba_open - Open database SYNOPSIS
resource dba_open (string $path, string $mode, [string $handler], [mixed $...]) DESCRIPTION
dba_open(3) establishes a database instance for $path with $mode using $handler. PARAMETERS
o $path - Commonly a regular path in your filesystem. o $mode - It is r for read access, w for read/write access to an already existing database, c for read/write access and database creation if it doesn't currently exist, and n for create, truncate and read/write access. The database is created in BTree mode, other modes (like Hash or Queue) are not supported. Additionally you can set the database lock method with the next char. Use l to lock the database with a .lck file or d to lock the databasefile itself. It is important that all of your applications do this consis- tently. If you want to test the access and do not want to wait for the lock you can add t as third character. When you are abso- lutely sure that you do not require database locking you can do so by using - instead of l or d. When none of d, l or - is used, dba will lock on the database file as it would with d. Note There can only be one writer for one database file. When you use dba on a web server and more than one request requires write operations they can only be done one after another. Also read during write is not allowed. The dba extension uses locks to prevent this. See the following table: DBA locking +-------------+---------------+---+---+---+---+---+---+---+ |already open | | | | | | | | | | | | | | | | | | | | | $mode = "rl" | | | | | | | | | | | | | | | | | | | | $mode = "rlt" | | | | | | | | | | | | | | | | | | | | $mode = "wl" | | | | | | | | | | | | | | | | | | | | $mode = "wlt" | | | | | | | | | | | | | | | | | | | | $mode = "rd" | | | | | | | | | | | | | | | | | | | | $mode = "rdt" | | | | | | | | | | | | | | | | | | | | $mode = "wd" | | | | | | | | | | | | | | | | | | | | $mode = "wdt" | | | | | | | | | | | | | | | | | | +-------------+---------------+---+---+---+---+---+---+---+ | not open | | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | |$mode = "rl" | | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | wait | | | | | | | | | | | | | | | | | | | | false | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | |$mode = "wl" | | | | | | | | | | | | | | | | | | | | | wait | | | | | | | | | | | | | | | | | | | | false | | | | | | | | | | | | | | | | | | | | wait | | | | | | | | | | | | | | | | | | | | false | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | |$mode = "rd" | | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | wait | | | | | | | | | | | | | | | | | | | | false | | | | | | | | | | | | | | | | | | |$mode = "wd" | | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | wait | | | | | | | | | | | | | | | | | | | | false | | | | | | | | | | | | | | | | | | | | wait | | | | | | | | | | | | | | | | | | | | false | | | | | | | | | | | | | | | | | | +-------------+---------------+---+---+---+---+---+---+---+ ook: the second call will be successfull. owait: the second call waits until dba_close(3) is called for the first. ofalse: the second call returns false. oillegal: you must not mix "l" and "d" modifiers for $mode parameter. o $handler - The name of the handler which shall be used for accessing $path. It is passed all optional parameters given to dba_open(3) and can act on behalf of them. RETURN VALUES
Returns a positive handle on success or FALSE on failure. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 4.3.0 | | | | | | | It's possible to open database files over net- | | | work connection. However in cases a socket con- | | | nection will be used (as with http or ftp) the | | | connection will be locked instead of the resource | | | itself. This is important to know since in such | | | cases locking is simply ignored on the resource | | | and other solutions have to be found. | | | | +--------+---------------------------------------------------+ SEE ALSO
dba_popen(3), dba_close(3). PHP Documentation Group DBA_OPEN(3)