unix system programming Unix-module1-4.ppt

unix system programming for under graduate students

1. UNIX PROGRAMMING HOME, PATH, Pathnames

2. Home Directory $ echo $HOME /home/ kumar

3. The PATH variable List of directories searched by shell to locate the command. $ echo $PATH / usr /local/bin : / usr /bin : /bin : / usr /local/ sbin : / usr / sbin : /home/ kumar /.local/bin : /home/ kumar /bin add / opt/bin to PATH $ PATH=$ PATH:/opt/bin $ echo $PATH / usr /local/bin : / usr /bin : /bin : / usr /local/ sbin : / usr / sbin : /home/ kumar /.local/bin : / home/ kumar /bin : / opt/bin

4. Absolute and Relative pathname Absolute pathname: $ cat /home/ kumar / login.sql Relative pathname $ cat / kumar / login.sql