shell if 濡備綍鍙栭潪
鍦⊿hell鑴氭湰涓紝鍙互浣跨敤!鎿嶄綔绗︽潵鍙栭潪銆傚叿浣撹娉曞涓嬶細
if ! condition; then
# code to be executed if the condition is false
else
# code to be executed if the condition is true
fi
鍦ㄤ笂杩颁唬鐮佷腑锛?code>!鎿嶄綔绗︾敤浜庡condition杩涜鍙栭潪鎿嶄綔銆傚鏋?code>condition涓簍rue锛屽垯鎵цelse鍚庨潰鐨勪唬鐮佸潡锛涘鏋?code>condition涓篺alse锛屽垯鎵цif鍚庨潰鐨勪唬鐮佸潡銆?/p>