Linuxexec file redirection

Linuxexec file redirection exec command: execls is executed in shell. After ls is completed, it does not return exec & lt; in the original shell; file uses the content in the file as the exec standard input exec & gt; file writes the content in the file as the standard exec3 & lt; file reads the file into fd3... linux exec file redirection exec command function exec ls execute ls in shell. After ls is completed, it does not return exec in the original shell. File: write the content in the file as the standard exec 3 <&3 fd3中读入的内容被分类 exec 4> File: writes the content written to fd4 to the file. the ls> & 4 Ls will not be displayed and will be directly written to fd4, in the above file, copy fd5 exec 3 from exec 5 <& 4 to create fd4 <&-disable fd3