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Old 08-18-2005, 05:20 PM   #1
Registered: Jul 2005
Distribution: Slackware
Posts: 208

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a.out does not run

I have a simple "hello world" program in my user directory that I compiled by typing "g++" It produces an output file "a.out" that is also in my user directory. When I type "a.out" at the command prompt I an error message that says something similar to "bash: command not found." Does anyone know why I can't run a.out?
Old 08-18-2005, 05:34 PM   #2
Senior Member
Registered: Jul 2004
Distribution: Ubuntu 7.04
Posts: 1,991

Rep: Reputation: 76
A program will be run if you provide the exact pathname to it or if it's in a directory listed in the $PATH environment variable.

Try running the program as
Old 08-22-2005, 08:57 AM   #3
Registered: Jul 2005
Distribution: Slackware
Posts: 208

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What is the reason for typing './' in './a.out' ?
Old 08-22-2005, 10:15 AM   #4
Registered: Dec 2003
Location: ~root
Distribution: Debian
Posts: 364

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To show that the a.out file is in the current folder.
Old 08-22-2005, 02:41 PM   #5
Registered: Aug 2003
Location: Berkeley, California, USA
Distribution: Red Hat Enterprise Linux, Debian & Ubuntu
Posts: 92

Rep: Reputation: 16
When the Linux shell executes commands, it first looks to see if you specified an explicit path name. If the shell doesn't see a path name, it searches in the PATH environment variable (Look in /usr/local/bin, then /usr/bin, etc).

This is a very unintuitive piece of Unix, and confuses many people. Some people get around this by setting PATH to include the current working directory, '.':

export PATH=".:$PATH"


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