QJOOMLA PHP TIPS Page 2:

 

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Q. How are dir different from ordinary files?
A. Directories are points that other paths can branch off from. Where as files are at the end of the paths that can not support other paths.

Q. Determine whether absolute/ relative pathname or file name

A. milk_co                                                    file name

     Correspondence/business/milk_co                 relative path name
/home/alex                                                   absolute path name
/home/alex/literature/promo                           absolute path name
..                                                                 absolute path name
letter.o610                                                    file name

Q. Should you ordinarily start your file names with a period? Why or why not?
A. No. Because a period makes a file a hidden file that is not visible ordinarily.

Q. List the command you can use to

1. make your home dir the working dir.
2. identify the working dir

A. a. cd

1. pwd

Q. If your working dir is /home/alex/literature what 2 different command you can use to create a subdirectory called classics ?

 

A. 1. Either  mkdir /home/alex/literature/classics
2. Or       mkdir classics

Q. What sequence of commands can you use to remove a dir called /home/jenny/temp and all its contents?
A. First we have to delete all the files in the directory using rm command as rm temp then we have to use cd  to get out of the working directory. Then we can use rmdir command as rmdir /home/jenny to delete the directory.

Q. Is the to_do file below a dir or an ordinary file? Do members of the pubs group have permission to read the file?
$ ls –l to_do
            -rw-r- -r- - 1 alex pubs 1338 May 24 17 : 01 to_do
What commands can alex use to give everyone write-permission to the file? Then what’ll be the output to ls –l?

1. It is a ordinary file because the output of ls –l command has ‘–‘ as first character. Pubs group has only read permission to the file as r- - indicates and pubs being mentioned in the ls –l output.

A   chmod 222 to_do will give everybody the write permission to the file.
A ls –l to_do will show
- - w- -w- -w- 1 alex pubs 1338 May 24 17 : 01 to_do

Q. What does it mean to have execute permission for a dir?
A. It means one can search through a directory.

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