Linux：Shell脚本基本命令

 24 if [ \( $# -eq 2 \) -a \( "$1" = "-A" \) ] ; then
 25     # Automatic mode
 26     line=`awk '($0 !~ /^#/ && $7 ~ /^'"$2"'$/) { print $1, $2, $3, $4, $5, $6, $7, $8 }' $srctree/boards.cfg`
 27     if [ -z "$line" ] ; then
 28         echo "make: *** No rule to make target \`$2_config'.  Stop." >&2
 29         exit 1
 30     fi
 31 
 32     set ${line}
 33     # add default board name if needed
 34     [ $# = 3 ] && set ${line} ${1}
 35 fi

$#：参数的个数
$1：第一个参数
$2：第二个参数
-a：并且
$0 != /^#/：不是以#开头
$7 ~ /^’ “$2” ’ $/ ：$7和$2相等