bash技巧

统计代码行数

find . -name "*.m" -or -name "*.h" | xargs grep -v "^$"| wc -l

获取脚本所在的路径

cwd=$(cd $(dirname ${0}); pwd)

跨行字符串

a="aa
b c
def"

echo $a #错误
echo "$a" #正确

正则表达式

# 存在连续的non-space字符
if [[ $line =~ [^\[:space:\]]+ ]]; then echo ${BASH_REMATCH[@]}; fi

# 存在连续的space字符
if [[ $line =~ [[:space:]]+ ]]; then echo ${BASH_REMATCH[@]}; fi