Because this result is held in an integer variable, a message to display the value should use a formatting code to pad to four characters with leading zeros for codes that are numbered less than 1000.
starts at the node associated with variable curlink (the absence of a leading forward slash means the first token is a variable name) and navigates to the parents of the parents of that start node.
The value of the -v option is stored in the ssversion variable while the cleansed version of the -p variable is stored in pathsuffix and the date, complete with leading hyphen is stored in datesuffix.
v 选项的值存储在 ssversion 变量中，清理后的 -p 变量存储在 pathsuffix 中，而日期（连同前导连字符）则存储在 datesuffix 中。