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Bash Shell Number Comparison

I am new Unix/Linux user. I am learning shell scripting. How can I compare numbers in bash shell?
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Linux / Unix: Use Cat Command To Append Data To a File

I am a new Unix user. I have Debian Linux installed. I need to append text to a file called daily.log. How do I use the cat command to append data to a file?
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Unix Create a File Command

I'm a new Unix user. How do I create a file from bash prompt without using GUI tools? How to create a file in Unix from terminal window? What's the easiest and best way to create a file in Unix?
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Bash: Assign Output of Shell Command To Variable

How do I assign the output of a shell command to a shell variable under Unix like operating system? For example, I want to store the date command output to a variable called $now. How do you do that?
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Linux / Unix: logname Command Examples To Display Loginname

logname command

I am a new Linux and Unix system user. How do I find out the current login name on Linux or Unix-like operating system using command prompt?
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Linux / Unix: id Command Examples

id command

I am a new Linux and Unix system user. How do I find out the user and groups names and numeric IDs of the current user or any users on my server? How can I display and effective IDs on the system using command line options? In Linux, how do I find a user's UID or GID?
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Linux: Set Environment Variable

Bash shell is used for various purposes under Linux. How do I customize the shell environment variable under Linux operating systems?
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HowTo: Get / Print Current Date in Unix / Linux Shell Script

How do I get the current date in Unix or Linux shell scripting and store it into a shell variable? How do I print the current date using Unix shell script?
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Howto: Call Shell Script function In echo statement

I need to call the function called foo() using echo command in the same statement. How do I all or invoke the function using the echo statement?
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Explains: echo Command (echo $”string”) Double-quoted String Preceded By a Dollar Sign

I noticed that many shell scripts in /etc/init.d/ directory use the following syntax:

echo $"Usage $prog start|stop|reload|restart"

Why a double-quoted string preceded by a dollar sign ($"string") using the echo command under Linux / UNIX bash scripts?
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