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This article mainly introduces how linux uses double quotation marks to quote variables, which is very detailed and has certain reference value. Friends who are interested must finish reading it!

Use double quotation marks to reference variables

Using double quotation marks when referencing (using the value of a variable) helps prevent unnecessary matching due to the separation of words caused by spaces and the recognition and extension of wildcards.

Look at the following example:

#! / bin/bash # Let the script exit set-o errexit # if the command fails, let the script exit set-o nounset echo "Names without double quotes" echo names= "Tecmint FOSSMint Linusay" for name in $names; do echo "$name" done echo echo "Names with double quotes" echo for name in "$names"; do echo "$name" done exit 0

Save the file and exit, and then run as follows:

$. / names.sh

Use double quotation marks in a script

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