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what wrong with it ? I cannot get the output, can anyone help , many thanks.

date.txt
xxx-CCC #text.....


#cat run
S01= sed -n '/$*-`echo AAA-BBB-CCC | cut -d- -f3`/p' data.txt
echo $*...

How to echo 4 backslashes more easy ? I can use 16 to echo 4 backslashes.

# echo \\
\
# echo \\\\
\
# echo \\\\\\
\\
# echo \\\\\\\\
\\
# echo \\\\\\\\\\
\\\
# echo \\\\\\\\\\\\
\\\
#...

How can I pass the name of the variable inside a for statment
I have a script something like below:

classA=12
classB=14
classC=16
# classD = 20

all_class="classA classB classC"

for i in ...