sorting - how can i make grep extract string by length in bash? -


i want able extract word thats specific length in wordlist , extract list.

if run:

grep -op '\b(\w{7})\b' infile >> outfile

eveything run fine , words extracted when run in bash script, nothing gets outputted. if put double quotes causing length number being read, still syntax error.so script looks this:

read -p "what in:" in read -p "what out:" out read -p "what char num:" char  grep -op '\b(\w{$char})\b' $in >> $out

what missing?

you need have double quotes bash expands variables in strings

try 

grep -op "\b(\w{$char})\b"

seeing in action:

input file

$ cat file1 dockerkill container docker anothercontainer dockerput contain

script: 

$ cat script.sh char="6" grep -op "\b(\w{$char})\b" file1

output

$ ./script.sh docker

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