Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

[Bash]Function returning a boolean

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting [Bash]Function returning a boolean
# 1  
Old 04-29-2009
[Bash]Function returning a boolean
Hello all,

I would like to know if it is possible to return a the result of a boolean expression from a function like this
Code:
function()
{
  # some code
  return [ $nb1 -lt 100 ] || [ $nb2 -lt 100 ]
}

and what will be the return value ?

Thank you for help.
# 2  
Old 04-29-2009

Code:
func()
{
  # ...
  [ $nb1 -lt 100 ] || [ $nb2 -lt 100 ]
}

The return code will be 0 (=success) if either nb1 or nb2 is less than 100.
# 3  
Old 04-29-2009
Alright thank you. I have another question though, now that i have my result is it possible to use it in another test in this way :

Code:
function_boolean
bool=$?
while [ $bool ] && [ boolean expression ]; do
  # ...
done

# 4  
Old 04-29-2009

Did you try it?

Did it work?
# 5  
Old 04-29-2009
Quote:
Originally Posted by dolphin06
Alright thank you. I have another question though, now that i have my result is it possible to use it in another test in this way :

Code:
function_boolean
bool=$?
while [ $bool ] && [ boolean expression ]; do
  # ...
done

Code:
bool=$?
while [ $bool ]

this will always be true. so you may want to compare like $bol > 0 or $bol =0 or something as you want.


Code:
bool=$?
while [[ $bool > 0 &&  true ]]; do
  # ...
done

cheers,
Devaraj Takhellambam
# 6  
Old 04-29-2009
Yes it tried, but didnt work the way i want, but i dont know where i m wrong even i m echoing some values.
# 7  
Old 04-29-2009
Alright its working now that i add the comparison operator.
Thanks guys.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Returning an exit code from a bash function

How to return a exit code from a function and use it in conditional? I tried the following but it does not seem to work. tests.sh: if test ./load.sh ; then echo "0" else echo "1" fi load.sh: return 1; from command line: $ ./tests.sh 0 I was expecting it to output "1"... (17 Replies)
Discussion started by: wolfv
17 Replies

2. Shell Programming and Scripting

Using boolean expression Bash script

Hi, Im trying to write a Bash script that calculates the least common subnet for two address. Theoretical: I have to change IP from decimal to binary, then apply XNOR on the two IPs. I tried to write this: #!/bin/bash echo "Ebter the first ip" read ip1 echo "Enter the second ip" read... (7 Replies)
Discussion started by: Miron
7 Replies

3. Programming

Malloc function returning NULL

Hi All, I am using malloc function for allocating dynamic memory. When I am using below code on Linux server its working fine, but When I am trying the same code on HP UNIX server its returning NULL. below is a fragment of code in which it is giving problem. tmp = (format_tree... (4 Replies)
Discussion started by: Taher Saifuddin
4 Replies

4. Shell Programming and Scripting

boolean expression in bash

Can someone, please, help me to make this condition valid/accepted in bash? I really cannot. I'm stuck with the brackets... This one tells me: missing `]' if ]; then # NOTIFY ERROR... fi And... I'd also appreciate a link to bash documents that explain these things. All... (2 Replies)
Discussion started by: mamboknave
2 Replies

5. Programming

Returning local string value from a function in C

Hi, If I have a code like this, what are the potential problems do you see? const char* const retString() { return "hello"; /* string literal */ } My questions are: a) Since the string literal which is already a constant read only data (cannot be... (4 Replies)
Discussion started by: royalibrahim
4 Replies

6. Programming

Function Returning Pointer

Hi guys. how a functions such fdopen, ... can return pointer? are these functions use static memory(variables)? (6 Replies)
Discussion started by: majid.merkava
6 Replies

7. Shell Programming and Scripting

Returning the name of function used

Hi All In my script, I can call on several functions. I have a logging function that is called by any of these functions. What I would like is some way of identifying which function I am using and pass this to the log function as some parameter. Is there some built in command or way of... (3 Replies)
Discussion started by: kingpin2502
3 Replies

8. Shell Programming and Scripting

returning from a function

Hi all, I am very new to BASH shell programming. I need to return an integer from a function to the caller function. I did this: but it keeps giving me wrong return: Can someone help me out here, please? Thanks (2 Replies)
Discussion started by: alirezan
2 Replies

9. Programming

create a thread from a returning function

hi all, my requirement is to create a thread by calling another function. i.e i dont call pthread_create directly from main, but by calling another function (createThd - below ), from main. Example: void *thread_function(void *arg) { /* thread function */ int i; rc =... (3 Replies)
Discussion started by: wolwy_pete
3 Replies

10. Programming

string returning function

I have two string returning function in ESQL/C char *segment_name(lbuffer) char *lbuffer; {..... and char *get_bpdvalue(f_name) char *f_name; {...... both declared above main() char *get_bpdvalue(); char *segment_name(); my problem is segment_name works on sprintf and strcpy... (5 Replies)
Discussion started by: jisc
5 Replies
Login or Register to Ask a Question