Shell appears syntax error near unexpected token ' < ' workaround

The latest when looking at a shell data, according to the textbook, but the following error, can not run

As follows, the simple script:

#!/bin/bashcat |  while Read Line  do  Echo $line  Done < < (data.txt|  awk'{print $}')

The following error occurred while running

sh while_test. SH while_test. SH 5: syntax error near unexpected token ' <'while_test. SH 5: ' Done < < (data.txt|  awk'{print $}')'

And then run it in a single line without errors

 while read line;  Do echo $line;  Done < < (cat data.txt|  awk'{print $}')1234

After the online view, confirm no footstep error, no DOS file error. There is no good way out. Through multi-party verification. The original is Bash 3.0, the shell has added a new symbol "<<<" to get sub-tasks

The script is now changed as follows to run successfully:

#!/bin/bashcat |  while Read Line  do  Echo $line  done <<< 'cat data.txt| awk ' {print $} "'

Run successfully

sh while_test. SH 1 2 3 4

Shell appears syntax error near unexpected token ' < ' workaround