sed, awk, vmstat netstat and mail commands

Shell Scripting Tutorial-19 sed, awk, vmstat, netstat and mail commads explained.

sed command is a stream editor used for modifying the files in unix (or linux). Whenever you want to make changed to the file automatically, sed comes in handy to do this.

Awk command / tool is used to manipulate text rows and columns in a file. Awk has built in string functions and associative arrays. Awk supports most of the operators, conditional blocks and available in C language.

vmstat is a tool that reports data about your machine’s processor,free memory,swap,io and cpu resource utilisation in real time.

netstat command is used to list out LISTENING ports, Established connections.

mail utility is used to send an script out. 

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Unix Shell Scripting Complete Video Tutorial Which Helps you to write advanced scripts Just Free

Shell Scripting Video Tutorials

UNIX SHELL SCRIPTING Video Tutorial, Each Link will has one Video Follow the Links one by one any complete your Shell Scripting Training without spending Single Rupee from your pocket. 

Awesome Right, We also appreciate if you can provide us the suggestions, improvements and complaints by commenting to this article. 

All Videos in Single Click

Complete Shell Scripting Content Video

BASICS OF UNIX

• Features of Unix
• Flavors of Unix/Linux
• Unix Architecture
• Unix file systems(Dir structure)

SHELL SCRIPTING BASICS

• What is shell scripting?
• Why to write shell script?
• How to write shell scripts?
• Meta data in shell scripts
• Code in shell scripting
• Executing shell script
• Debugging shell scripts

BASH SHELL ABILITIES

• Bash Shell Shortcuts
• Command chaining
• History Command
• Alias
• Variables(System and user defined)
• Quotes(single, double and inverted)
• Brackets(square, flower, normal)
• Redirect operators(input, Output, Pipe, Error)
• Wild cards(*, ?)
• Escape characters(/n, r etc)

COMMANDS

• System info commands($SHELL, tty and env)
• Getting Help from Command Line 
• Linux Disk Utilities free, df, du, fdisk and parted commands 
• tr and wc commands to count lines, characters and words
• w, who, hostname, hostnamectl and uname commands
• more, tail, head and sort commands 
• diff and grep command explained with regular expressions 
• cp, rm, mv, rmdir, time and exit commands 
• touch, mkdir, cat, ls, cd and date commands 
• touch command with 25 practical examples 
• ls command with 25 practical examples 
• Viewing files(head, tail, vi, cat, more, less, pg)
• Simple filters(grep, cut, paste)
• Sorting & Compare(sort, uniq, cmp, diff, tr)
• Regular expressions(Basic, Interval and extended)
• Advanced filters(AWK and SED)
• Find command
• Miscellaneous commands

CONTROL/CONDITIONAL STATEMENTS

• test command
• eval command
• expr command
• $(( ))
• &&, || AND - OR Operators
• Assignment, Arithmetic, Bitwise, Logical operators
• Numerical, string, file tests
• If statements
• If else Statements
• For loop
• While loop
• Untill loop
• Case statement
• Break, sleep, continue, exit
• Functions

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Complete RHCSA and RHCE Course Content

RHCSA Certification and RHCE Certification Complete Guide

S. No	Topic Description	Course Name
Previous 1 2 3 4 5 Next
1	Introduction to course outline and certification	RHCSA
2	Linux Architecture	RHCSA
3	Linux Vs Windows	RHCSA
4	Linux Directory Structure	RHCSA
5	Installing VMWare work Station	RHCSA
6	Configuring virtual Network communication	RHCSA
7	Installing Linux Operating system using Installation media (DVD)	RHCSA
8	Installing and configuring Lab Main Server / DNS / LDAP / Kerberos, Certificate Authority and 389 Directory Server	RHCSA
9	Bash shell features	RHCSA
10	Managing files & directories	RHCSA
11	Basic Commands ls, cp, mkdir, cat, rm and rmdir	RHCSA
12	Getting help from using command line (whatis, whereis, man, help, info, –help and pinfo)	RHCSA
13	Editing Viewing of text files using nano	RHCSA
14	Linux Directory Structure	RHCSA
15	Using visual editor & visual editor modified to edit files	RHCSA
16	User Administration Creating, Modifying and Deleting	RHCSA
17	Controlling services & daemons	RHCSA
18	IPv4 Networking	RHCSA
19	Installing and configuring SSH Server & Client	RHCSA
20	Listing and managing processes	RHCSA
21	Prioritize process	RHCSA
22	Analyze & storing logs	RHCSA
23	Syslog Server & Client configuration	RHCSA
24	Compressing files & directories (tar and zip)	RHCSA
25	Copying files & directories to remote servers	RHCSA
26	Red Hat Package Manager	RHCSA
27	Installing and configuring Local Yellodog Updater, Modified	RHCSA
28	Installing and configuring FTP / HTTP Yellowdog Updater, Modified	RHCSA
29	Managing network interfaces using nmcli utility	RHCSA
30	Searching files and directories	RHCSA
31	File & Directory links (Soft Links and Hard Links)	RHCSA
32	Managing of physical storage – Creating Standard Partitions	RHCSA
33	Creating and Managing Logical Volume Manager	RHCSA
34	XFS quota management	RHCSA
35	Access Control List (ACL)	RHCSA
36	Scheduling of future Linux tasks using at & Crontab	RHCSA
37	SeLinux Overview	RHCSA
38	SeLinux Policy types, Listing policies and applying policies	RHCSA
39	NFS Server and Client configuration	RHCSA
40	Firewalld – configuring and managing rules	RHCSA
41	Securing the NFS using kerberos	RHCSA
42	Adding server as LDAP client	RHCSA
43	Setting up LDAP users home directory	RHCSA
44	Accessing the network storage using (CIFS) samba	RHCSA
45	Samba Multi-user Access	RHCE
46	Using Virtualized systems	RHCE
47	Creating virtual Machines	RHCE
48	Automated installation of Redhat Linux	RHCE
49	Automated Installation using Kickstart	RHCE
50	Explaining Linux booting process	RHCE
51	Recovering forgotten root password	RHCE
52	Recovering forgotten root password method-2	RHCE
53	Fixing Partition Errors – using emergency mode	RHCE
54	Managing daemons and services	RHCE
55	MariaDB Installation and Configuration	RHCE
56	Using regular expressions with grep	RHCE
57	Installation & configuration of DHCP Server – reserving IP address	RHCE
58	DNS master server zones installation & configuration	RHCE
59	Installing and Configuring the Web / Httpd/ Apache Server	RHCE
60	Configuring virtual web server	RHCE
61	Making secure web server (https) ssl enabled web server	RHCE
62	WSGI script enabled web server	RHCE
63	Networking IPv6 assigning IPv6 Address	RHCE
64	Time synchronising using NTP server and client	RHCE
65	Configure a system to forward all email to a central mail server	RHCE
66	Install and configure MariaDB	RHCE
67	Backup and restore a database	RHCE
68	Create a simple database schema	RHCE
69	Perform simple SQL queries against a database	RHCE
70	Configure a system as either an iSCSI target or initiator that persistently mounts an iSCSI target	RHCE
71	Use network teaming or bonding to configure aggregated network links between two Red Hat Enterprise Linux systems	RHCE