POS 433 Week 3 File Processing Commands Worksheet NEW

1. I am now in $HOME/sales/east directory. I want to have my login shell display me today’s date whenever I login every time by telnet.
   For this, what steps I have to do? (1/2)
   A. $ vi .profile
   Type one line : echo “Today’s date is date“
   $ chmod +x .profile
   $ . .profile

B. $ cd ../..
$ vi .profile
Type one line : echo “Today’s date is date“
$ export .profile
$ .profile

C. $ cd $HOME
$ vi .profile
Type one line : echo “Today’s date is date“
$ . .profile

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D. $ vi ~/.profile
Type one line : echo “Today’s date is “date”
$ . .profile
Ans:

2A. Why I am getting this error when I assign like this ? (1/2)
$ FIRST-NAME=smith
ksh: FIRST-NAME=smith: not found.
Ans:
2B. Under ksh or bash shell environments, what is the problem here ? (1/2)
$ export PATH=/usr/bin /usr/local/bin /usr/ucb/bin
Ans:

1. Executing cp temp/temp1 temp1.txt it will result in… (1/2)

A. Error since the same filename is used
B. Error since an extension is used for the second temp1
C. It will move the contents of temp1 from directory temp to temp1 of current directory and when finished it will erase the contents of temp1 of temp directory
D. It will copy temp1 from directory temp to temp1.txt of current directory

Ans :

1. What kind of files will be matched by the following when you list by ls command: (3)
   For Ex :
   $ ls [a-z][0-9]
   Ans : This matches any file with 2 characters, first being a lower case letter and the second being a number from 0 to 9

A. ls [0-9][a-z][0-9][A-Z] — Note : there are no spaces anywhere.

Ans:
B. ls [A-Z0-9_][A-Za-z_0-9] — Note : there are no spaces anywhere.

Ans:
C. ls [0-9]Z[0-9]

Ans:

1. What is the command to list files in a directory: (2)

A. Having only three alphabets:

Ans:
B. Starting with a digit and ending with a digit

Ans:

1. There are many C programs in my directory which have an extension of .c (ex :first.c, second.cetc).
   How can I concatenate all C files into one file called “myC_files (1)

Ans :

1. How do you sort first 15 lines in a file called ‘datafile” ? (1) (You need to use a pipe)
   Ans:
2. How do you add a line to the end of an existing file “myfile” with date stamp. (1)
   Ans :

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