Shell Scripting related

Issue 1: Read the same line of two files simultaneously and insert the rows of two files into the same text

# cat aaa1a2a3a4# Cat bbb1b2b3/# vim aa.sh#!/bin/bashwhile read-u3 i && read-u4 j;doecho $i $jdone >cc 3<a A 4<bb#./aa.sh# cat CCA1 b1a2 b2a3 b3/

Note that READ-U3 I reads the contents from the file Descriptor 3 and assigns the value to the $i variable. The 3<AA representative reads the contents from the AA and redirects to the file descriptor 3 that the >CC represents the output of the while execution is redirected out to CC in 3<AA 4<BB written in the while, which is equivalent to only the while statement being redirected, while the end of the 3,4 would have been gone. If you use EXEC 3<aa 4<BB in front of the while, the redirected 3,4 will persist from exec until the end of the script. If you need to use AA,BB only in while, it is the best way to do it now. If you want to continue to access after while, consider the way exec 3<aa. The overall process of the statement is: continuously from the AA and BB to read the contents of I, J, and then printed with Echo, and the results are continuously appended to CC. This loop is executed until at least one of the end of the file is encountered in AA or BB. The script can be used for merging, splicing multiple text content for a long time useless 51cto write things, because the feeling of the editor is very bad, so long time again use found the original is not good use, perhaps I will not use it. How do I cancel this script format? Looking for a half day can not find the way to cancel.

Shell Scripting related