Exercise $4$: Minimum Permissions for common file operations

In the table below, give in symbolic $rwx$ form the minimum permissions an ordinary $($non$-$root$)$

user requires to successfully complete the commands listed in the left column below. "Minimum"

means the least amount of rwx permissions needed.

How many of rwx can you take away and still perform the given command successfully? Test

your guess to make sure you are correct, using commands $1-7$ above. Do not forget to replace

"srcdir" and "targetdir" with example directories in your home directory, "srcfile" and "oldfile" with

an existing file in your home directory, and "newfile" with a name of a new file to create

Recall that some commands require permissions on the directory; some require permissions on

the data$($file$)$; some require both.

$\{$cslinux$1$: $\}$ cp srcdir$/$srcfile targetdir$/$

$\{$cslinux$1$: $$ m srcdir$/$srcfile targetdir

$\{$cslinux$1$: $\}$ ln srcdir$/$srcfile targetdir

$\{$cslinux$1$: $\}$ rm srcdir$/$srcfile

$\{$csinux$1$: $$ cat srcdir$/$srctile

$\{$cslinux$1$: $$ date $$ dir$/$oldfile $($modify an existing file$)$

$\{$cs$1$inux$1$: $\}$ate $$ dir$/$newfile $($create a new file in an existing directory$)$

For commands $6$ and $7$ above, the directory is not a "source" directory since nothing is being

read from it$,$ and the file is not a "source" file since it is being written to $($it is an output target$).$

Use the first two columns in the table below to record permissions for the directory and the target

file for $6$ and $7$ above.

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