Linux shell while file reading error Solution

In linux shell while, when reading a file, an error is reported. When... do reads the file, an error is returned. Script Name: while_readFile.sh script content: Shell code #! /Bin/sh while read LINE abc do echo $ LINE <strong> <span style = "color: # 0000ff;"> done <(cat. /a.txt) </span> </strong> Note: there is a space between the two <. The execution result is as follows: [root @ localhost while] #. /while_readFile.sh. /while_readFile.sh: line 5: syntax error near unexpected token '('. /while_readFile.sh: line 5: 'done <(cat. /a.txt) 'if bash is used for execution, there is no problem: [root @ localhost while] # bash while_readFile.sh11: 22aa: bbb: cc: dd is Because sh does not perform the blue mark usage. The script is modified as follows to support sh: Shell code #! /Bin/sh while read LINE abc do echo $ LINE done <./a.txt