20、Basic Shell_for_while_grep_find

转载：https://github.com/swcarpentry/DEPRECATED-boot-camps/blob/master/shell/shell_cheatsheet.md

1、For  loop

list[0]=Sam

list[1]=Lynne

list[2]=Dhavide

list[3]=Trevor

for varname in ${list[@]}

do
    echo $varname
done

2、While Loop

COUNTER=0
while [ ${COUNTER} -lt 10 ]; do
    command 1
    command 2
    COUNTER=`expr ${COUNTER} + 1`
done

3、grep

grep   -v -A1   -w  -Ff   gene_id    gene.fa