Hi,

I want a perl script that retreives only the gi id's i.e 159040991, 159041230, and so on..in a straight line from fasta files (I pasted below the file as an example) I have more than 250 files to work with. can anyone help me with the perl script.

Thanks 
>gi|159040991|ref|YP_001540243.1| glycoside hydrolase family protein [
+Caldivirga maquilingensis IC-167] >gi|157919826|gb|ABW01253.1| glycos
+ide hydrolase family 1 [Caldivirga maquilingensis IC-167]
MDISFPKSFRFGWSQAGFQSEMGTPGSEDPNTDWYVWVHDPENIASGLVSGDLPEHGPGYWGLYRMFHDN
+AVKMGLDIAR
INVEWSRIFPKPMPDPPQGNVEVKGNDVLAVHVDENDLKRLDEAANQEAVRHYREIFSDLKARGIHFILN
+FYHWPLPLWV
HDPIRVRKGDLSGPTGWLDVKTVINFARFAAYTAWKFDDLADEYSTMNEPNVVHSNGYMWVKSGFPPSYL
+NFELSRRVMV
NLIQAHARAYDAVKAISKKPIGIIYANSSFTPLTDKDAKAVELAEYDSRWIFFDAIIKGELMGVTRDDLK
+GRLDWIGVNY
YSRTVVKLIGEKSYVSIPGYGYGCERNSISPDGRPCSDFGWEFYPEGLYDVIMKYWSRYHLPIYVTENGI
+ADAADYQRPY
YLVSHIYQVYRAIQEGANVKGYLHWSLTDNYEWASGFSMRFGLLQVDYSTKKQYWRPSAYVYREIAKSKA
+IPEELMHLNT
IPPTRSLRR
>gi|159041230|ref|YP_001540482.1| glycoside hydrolase family protein [
+Caldivirga maquilingensis IC-167] >gi|157920065|gb|ABW01492.1| glycos
+ide hydrolase family 1 [Caldivirga maquilingensis IC-167]
MIKFPSDFRFGFSTVGTQHEMGTPGSEFVSDWYVWLHDPENIASGLVSGDLPEHGPGYWDLYKQDHSIAR
+DLGLDAAWIT
IEWARVFPKPTFDVKVKVDEDDGGNVVDVEVNESALEELRRLADLNAVNHYRGILSDWKERGGLLVINLY
+HWAMPTWLHD
PIAVRKNGPDRAPSGWLDKRSVIEFTKFAAFIAHELGDLADMWYTMNEPGVVITEGYLYVKSGFPPGYLD
+LNSLATAGKH
LIEAHARAYDAIKAYSRKPVGLVYSFADYQPLRQGDEEAVKEAKGLDYSFFDAPIKGELMGVTRDDLKGR
+LDWIGVNYYT
RAVLRRRQDAGRASVAVVDGFGYSCEPGGVSNDRRPCSDFGWEIYPEGVYNVLMDLWRRYRMPMYITENG
+IADEHDKWRS
WFIVSHLYQIHRAMEEGVDVRGYFHWNLIDNLEWAAGYRMRFGLVYVDYATKRRYFRPSALVMREVAKQK
+AIPDYLEHYI
KPPRIE

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In reply to perl script by sainath

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