Shell Scripting Learning (iii)

Shell echo Command

Display Normal string:

echo "I am cat_crazy."

Note: The double quotes here can be omitted

Show escape characters:

If you want to output quotes, the * number needs to be escaped to output, as follows

echo \ "I am cat_crazy\"

The output is "I'm cat_crazy."

Note: Quotes need to be escaped to output

Display variables:

Name= "Cat_crazy"

Echo $name

Show line breaks:

Echo-e "Hello \ n" #-e open escape \ n line break

echo "Cat_crazy"

The output is:

Hello

Cat_crazy

Note: There is a blank line in the middle

Show No Line breaks

Echo-e "Hello \c" #-e Open escape \c No Line break

echo "Cat_crazy"

Output Result:

Hello Cat_crazy

Show results directed to a file

echo "Cat_crazy" > MyFile

Note: This results will be saved directly to the MyFile file, the MyFile file if there will be overwritten if there is no create

Output characters as-is, without escaping or taking variables (using single quotes)

echo ' $name \ '

The output is $name \ "

Show command execution results:

echo ' Data '

Output Results January 17, 2017 Tuesday 13:23:35 CST

Note: command to use anti-quote wrapping

Shell Scripting Learning (iii)