bash - How to include variables in the sed command? - 


grep -f "$name" -a1000 filename | sed -n '1p;19p;24p'

assume let a=10,b=20,c=30.in above grep command can use '$ap;$bp;$cp' instead of '1p;19p;24p'?

another thing, i've given -a1000. implies starting 1p considers till 1000 line , right? need search throughout file without giving number.

if want include variables inside quotes, need use " instead of '.

if want add alphanumeric suffix variable need indicate it's not part of it's name.

sed -n "${a}p;${b}p;${c}p"

or:

sed -n "$a"'p;'"$b"'p;'"$c"'p'

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