131. The use of the script determines the number of input parameters

131. Determine the number of input parameters using the script, I can not remember a specific topic.
132. compression and decompression tar command
133. cpio application method on a Unix
134. tail scroll browse command
135. ln establish flexible connections
136. format applications
137. ifconfig ip address configuration
138. cp file folder cover
139. crontab applications
140. Understanding of the information services