Comments on: Learning the bash shell, continued https://gregladen.com/blog/2009/05/29/learning-the-bash-shell-contin-1/ Sat, 30 May 2009 20:24:51 +0000 hourly 1 https://wordpress.org/?v=6.4.8 By: Greg Laden https://gregladen.com/blog/2009/05/29/learning-the-bash-shell-contin-1/#comment-536091 Sat, 30 May 2009 20:24:51 +0000 http://scienceblogs.com/gregladen/2009/05/29/learning-the-bash-shell-contin-1/#comment-536091 Forget JanieBelle? That’s why I drink!

]]> By: Stephanie Z https://gregladen.com/blog/2009/05/29/learning-the-bash-shell-contin-1/#comment-536090 Sat, 30 May 2009 18:59:40 +0000 http://scienceblogs.com/gregladen/2009/05/29/learning-the-bash-shell-contin-1/#comment-536090 Another one. Can’t forget JanieBelle.

]]> By: Greg Laden https://gregladen.com/blog/2009/05/29/learning-the-bash-shell-contin-1/#comment-536089 Sat, 30 May 2009 18:55:51 +0000 http://scienceblogs.com/gregladen/2009/05/29/learning-the-bash-shell-contin-1/#comment-536089 w00t!!!! We got one!!!!

]]> By: GaryB, FCD https://gregladen.com/blog/2009/05/29/learning-the-bash-shell-contin-1/#comment-536088 Sat, 30 May 2009 13:25:36 +0000 http://scienceblogs.com/gregladen/2009/05/29/learning-the-bash-shell-contin-1/#comment-536088 Greg, I first started reading your blog because of my interest in the evolution debate (I’ve been a member of t.o. since 2002) but I’m now finding an increased interest in Linux due to the information and resources you provide and link to. Although I was a programmer (emphasis on ‘was’), with a B.Sc. in CS, and currently own a computer sales and service company dealing exclusively with PCs, my change over on my personal machines to Ubuntu was in large part due to your blog.

Thanks.

]]> By: Greg Laden https://gregladen.com/blog/2009/05/29/learning-the-bash-shell-contin-1/#comment-536087 Sat, 30 May 2009 07:35:56 +0000 http://scienceblogs.com/gregladen/2009/05/29/learning-the-bash-shell-contin-1/#comment-536087 I believe in bash it’s hash, not rehash. I’m not sure if it rehashes as you say, but it might. With bash there are multiple versions, and this is the kind of detail that might vary from version to version. We need a more advanced reference book … coming soon … to evaluate this.

I’ve updated the above post.

]]> By: JohnnieCanuck https://gregladen.com/blog/2009/05/29/learning-the-bash-shell-contin-1/#comment-536086 Sat, 30 May 2009 01:45:59 +0000 http://scienceblogs.com/gregladen/2009/05/29/learning-the-bash-shell-contin-1/#comment-536086 Jason,

To continue the communal nit removing, am I right that you shouldn’t need to login/logout to get bash to rebuild the hash table? Whereas in csh, one can use rehash, bash will do a rehash automatically on failure to find the command.

My shell experience is old and like Greg’s was, incomplete.

]]> By: Jason Thibeault https://gregladen.com/blog/2009/05/29/learning-the-bash-shell-contin-1/#comment-536085 Sat, 30 May 2009 00:23:16 +0000 http://scienceblogs.com/gregladen/2009/05/29/learning-the-bash-shell-contin-1/#comment-536085 Just want to make a very minor semantic correction (and only because, this one, I *know* I’m not going to mess up, not like that Asus thing): referring to /bin might be confusing to a newbie, though you correctly identified it in describing it at the beginning as a folder in your home. ~/bin and /bin are completely different — any path starting with / indicates it is a folder in the root of the file system. Any path starting with ~ means, start from your currently logged in user’s home folder. It’s nitpicky, but might as well display the path to the user as it shows up on the screen.

Also, this happened on my computer just now:

jthibeault@laptop:~$ touch ./bin/tester.sh
jthibeault@laptop:~$ chmod +x ./bin/tester.sh
jthibeault@laptop:~$ which tester.sh
jthibeault@laptop:~$ tester.sh
bash: tester.sh: command not found

Hmm, what have we here? It’s not working for me! More investigation:

jthibeault@laptop:~$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/lib/jvm/java-6-sun-1.6.0.12/jre/bin/

Well that’s interesting. My home folder isn’t on the path. A bit more digging and I discover normally that gets added to a default .bash_profile when you first set up a new user under Ubuntu.

jthibeault@laptop:~$ ls .bash_profile
ls: cannot access .bash_profile: No such file or directory

Strangely, it also doesn’t exist in /etc/skel — which is the skeleton user info that’s copied to all new users’ home folders. So something might be wrong with my install. Regardless, this can be rectified by adding this line:

export PATH=$PATH:/home/jthibeault/bin

to the end of my ~/.bashrc file (think of this as your user profile’s Start Menu Startup folder, or more accurately, autoexec.bat file in old DOS parlance). After a logout / login, I’d then have ~/bin on my path, and could run my (blank) tester.sh just fine.

]]>