Evaluate Variable At Runtime Post: 302835235

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how to get variable to re-evaluate itself?

Probably a simple one. Basically I am retrieving a number from a file - setting a variable against it and then incrementing this by 1 and using this as an entry number in a log file for messages. I need the variable to re-evalute itself each time I call it so I get the latest number in the file -...

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Evaluate the value of a variable?

I have variables: FOO="Text" BAR="FOO" I'd like to be able to evaluate the variable named as the value of $BAR. echo $FOO Text echo $BAR FOO This is what I'd like to do: echo ${$BAR} (this won't work) Text

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Let's say for example that we have two different ways was can code the exact same program to achieve the same result. What is the best way to determine which of the two methods is the best solution? Is it as simple as basing it on how long the program takes to run or is there a more...

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generating the variable list for WHILE READ statement at runtime

Hi, I am reading the contents of a file in variables as - cat ${var_file_name} | while read COL1 COL2 COL3 COL4 COL5 COL6 COL7 COL8 COL9 COL10 COL11 The problem is ... my file can have any number of columns - 5, 10, 11 .... So i want a dynamic variable list as - cat ${var_file_name} |...

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Evaluate string containing shell variable names

Hello, I have this: #!/usr/bin/ksh V1=ABC str="hello 123;${V1}" eval "echo $str" i get hello 123 /script.sh ABC not found However eval works if $str variable doesn't contain a semicolumn (eg if str="hello 123~${v1}" running the eval statement above would produce

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How to evaluate the value of a variable ?

How to evaluate the value of a variable ? For example: a=var $a=value !!!error happens!!! I want to evaluate var=value, how to realize it? Thanks! ---------- Post updated at 03:37 AM ---------- Previous update was at 02:22 AM ---------- I am using linux bash. a=var $a=value...

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How does ||: evaluate?

In BASH, how does ||: get interpreted. I know || is logical or. And I believe : evaluates to true. Can someone give a thorough explanation for this usage? Example for i in $IGGY do && skipdb=1 || :

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How to evaluate a variable name on LHS of expression?

I am trying to write a simple function to select values from a database and assign them to variables. It can have any number of arguments sent into it, and I want to assign the value retrieved to a different variable name for each argument sent in. So my code looks something like this: ...

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Evaluate Expression within awk

I want to create a conditional expression string and pass in an awk script. My script is as below... comm="\$3 == "hello"" awk -F "^T" -v command="${comm}" ' { if ( command ) { print "hye" } }' testBut the statement "if ( command )" always evaluates to true which is not...

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Runtime variable extraction

Hi There, var1=value1 var2=value2 var3=value3 for (( i=1; i<4; i++ )) do temp=var$i echo "$temp" done OUTPUT var1 var2 var3 I want the output to be value1 value2

LEARN ABOUT X11R4

times

times(1)							   User Commands							  times(1)

NAME

       times - shell built-in function to report time usages of the current shell

SYNOPSIS

   sh
       times

   ksh
       times

DESCRIPTION

   sh
       Print the accumulated user and system times for processes run from the shell.

   ksh
       Print the accumulated user and system times for the shell and for processes run from the shell.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words,  following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
	   able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation  are  not
	   performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), sh(1), time(1), attributes(5)

SunOS 5.10							    15 Apr 1994 							  times(1)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

how to get variable to re-evaluate itself?

Discussion started by: frustrated1

2. Shell Programming and Scripting

Evaluate the value of a variable?

Discussion started by: Ilja

3. Programming

How to evaluate which coding approach is best?

Discussion started by: jmvbxx

4. Shell Programming and Scripting

generating the variable list for WHILE READ statement at runtime

Discussion started by: gopalss