String

Native String

Strings in bash can be native without any quote.

name=john_smith # it's a string without quotes

Raw String

Use single quotes to represent a raw string. All escapes are treated as literal.

script='
    cd $(ls ~/projects/* | fzf)
    echo hello
'

NOTE

You can't interpolate in single quote string

Interpolated String

Use double quotes to represent interpolated string.

first_name=john
last_name=smith
fullname="$first_name $last_name"

The best practice is using the complete ${} to distinguish between.

number=123
echo "$number456" # foo123 not avaiable in the context
echo "${name}456" # use this instead!

String Concatenation

Strings can be concatenated directly side by side except spaces.

first_name=john
last_name=smith
fullname=${first_name}${last_name}    # johnsmith
fullname=${first_name}" "$last_name # john smith
fullname=$first_name $last_name   # error: command not found

+= Operator

toggleterm disabled, use normal nvim to test it today.

foo=abc
foo+=def # abcdef

WARNING

+= will do numeric operation when two operands are both valid numeric strings.

NOTE

Always prefer interpolation over concatenation.