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Using Linux Command 3

Using Linux Command 3. Lab#6. Some useful commands [clear]. The clear command clears your terminal and returns the command line prompt to the top of the screen. [ root@localhost /root]# clear. Directories [rmdir]. rmdir—Remove empty directories. # rmdir dir1. cal [[0-12] 1--9999].

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Using Linux Command 3

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  1. Using Linux Command 3 Lab#6

  2. Some useful commands [clear] The clear command clears your terminal and returns the command line prompt to the top of the screen. [root@localhost /root]#clear

  3. Directories [rmdir] rmdir—Remove empty directories #rmdir dir1

  4. cal[[0-12] 1--9999] Prints out a nicely formatted calendar of the current month, or a specified month, or a specified whole year. [root@localhost /root]#cal 1947

  5. df Stands for disk free This tells you how much free space is left on your system. [root@localhost /root]#df -h

  6. free Prints out available free memory. You will notice two listings: swap space and physical memory. [root@localhost /root]#free

  7. wc wc [-c] [-w] [-l] <filename> Counts the number characters/bytes(with -c),words(with -w) or lines (with-l) in a file. [root@localhost /root]#wc –c /etc/passwd

  8. Determining file type file <filename> This command prints out the type of data contained in a file. will tell you that portrate.jpg is a JPEG image data, # file portrate.jpg

  9. head Syntax: head [-count | -nnumber]filename This command will display the first few lines of a file. By default, the first 10 lines of a file are displayed. However, you could use the preceding options to specify a different number of lines. # Outline of future projects ff Last modified: 02/02/99 [root@localhost /root]#head -2 doc.txt

  10. tail [root@localhost /root]# tail -50 doc.txt [root@localhost /root]# tail -r doc.txt

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