Text-processing tools on Linux systems exercises

1. Display the line in the/proc/meminfo file that begins with the size S; (Requires: use two ways)

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2. Display lines in the/etc/passwd file that do not end in/bin/bash

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3. Show user RPC default shell program

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4. Find out the two-bit or three-digit number in/etc/passwd

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5. Display a line in a/etc/grub2.cfg file that starts with at least one whitespace character and that is followed by a non-whitespace character

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6. Find the line ending with ' LISTEN ' followed by 0, 1, or more whitespace characters in the result of the "Netstat-tan" command

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7. Add user bash, Testbash, basher, and Nologin (whose shell is/sbin/nologin), then find the line in the/etc/passwd file with the name of the shell

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1. Displays the UID and default shell of the current system root, mage, or Wang user

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2. Find the line at the beginning of the/etc/rc.d/init.d/functions file that has a word (including an underscore) followed by a parenthesis

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3. Use Egrep to remove its base name in/etc/rc.d/init.d/functions

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4. Use Egrep to remove the directory name of the path above

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5. Count the number of logons per remote host IP address logged in as root

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6. Use extended regular expressions to represent 0-9, 10-99, 100-199, 200-249, 250-255, respectively

7. Display all IPV4 addresses in ifconfig command results

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Text-processing tools on Linux systems exercises