041 case statements kho tài liệu training

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Case Statements LinuxTrainingAcademy.com What You Will Learn ● Case statements LinuxTrainingAcademy.com Case Statements ● Alternative to if statements ○ ○ ○ ○ ● if [ "$VAR" = "one" ] elif [ "$VAR" = "two" ] elif [ "$VAR" = "three" ] elif [ "$VAR" = "four" ] May be easier to read than complex if statements LinuxTrainingAcademy.com case "$VAR" in pattern_1) # Commands go here ;; pattern_N) # Commands go here ;; esac LinuxTrainingAcademy.com case "$1" in start) /usr/sbin/sshd ;; stop) kill $(cat /var/run/sshd.pid) ;; esac LinuxTrainingAcademy.com case "$1" in start) /usr/sbin/sshd ;; stop) kill $(cat /var/run/sshd.pid) ;; *) echo "Usage: $0 start|stop" ; exit ;; esac LinuxTrainingAcademy.com case "$1" in start|START) /usr/sbin/sshd ;; stop|STOP) kill $(cat /var/run/sshd.pid) ;; *) echo "Usage: $0 start|stop" ; exit ;; esac LinuxTrainingAcademy.com read -p "Enter y or n: " ANSWER case "$ANSWER" in [yY]|[yY][eE][sS]) echo "You answered yes." ;; [nN]|[nN][oO]) echo "You answered no." ;; *) echo "Invalid answer." ;; esac LinuxTrainingAcademy.com read -p "Enter y or n: " ANSWER case "$ANSWER" in [yY]*) echo "You answered yes." ;; *) echo "You answered something else." ;; esac LinuxTrainingAcademy.com Summary ● ● ● Can be used in place of if statements Patterns can include wildcards Multiple pattern matching using a pipe LinuxTrainingAcademy.com ...What You Will Learn ● Case statements LinuxTrainingAcademy.com Case Statements ● Alternative to if statements ○ ○ ○ ○ ● if [ "$VAR" = "one" ] elif [ "$VAR"... to read than complex if statements LinuxTrainingAcademy.com case "$VAR" in pattern_1) # Commands go here ;; pattern_N) # Commands go here ;; esac LinuxTrainingAcademy.com case "$1" in start) /usr/sbin/sshd... ;; esac LinuxTrainingAcademy.com case "$1" in start) /usr/sbin/sshd ;; stop) kill $(cat /var/run/sshd.pid) ;; *) echo "Usage: $0 start|stop" ; exit ;; esac LinuxTrainingAcademy.com case "$1" in
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