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Hello AAhinka,

Not sure about your complete requirement, but could you please try echo $1 in place of grep $1but this is a wild guess only, let us know the input with complete expected output, so...

What are you grep-ping for here grep $1 | ...?

[ ] have special meaning in grep.
Either use fgrep (or grep -F):
fgrep 'value[71]' test_file.dat
or escape the special meaning:
grep 'value\[71\]' test_file.dat

Try:
awk 'NF>1{s=s (s?";":x) $2; sub(/;$/,x,s)} END{print s}' file
or
awk 'NF>1{sub(/;$/,x,$2); print $2}' file | paste -sd\; -