shell - Extracting lines from a file that match a list of IDs -

hopefully i'm going make sense here...

i have huge file - each line represents data different individual. want grep (or extract) out information (lines) individuals - don't want keep greping out individuals individually appending @ end curious whether there loop can set proving text file ids (ie id001, id002... id100) or variable unique each individual. i'm new programming i'm not sure should googling/looking answer - possible in shell?

apologies might simple question.

thanks!

edit 1: i'm adding little more info here: format might different file genetics file , has following format:

fam001 id001 a t t tc t a…… g fam001 id002 a t t c c g…… t c fam004 id003 a t g t g a…… g . . fam100 id100 g c t c g t g…… t g 

is possible set loop, say, similar to/includes this:

for f in $( cat ~/famid.txt ) 

with famid.txt as:

fam001 fam050 fam087 

to able run analysis on individuals famid id running program on families in list provided?

hope makes sense.

this need:

grep -wff famid.txt data.txt 

where:

• -f famid.txt tells grep read patterns file
• -f tells grep patterns plain strings can pick appropriate matching engine
• -w tells grep match patterns form whole word (so if accidentally "fam" in pattern file, don't match every line of data file)