如何在Bash中成對循環$ @？

Question

怎麼辦我寫在bash一個循環，這並不像下面的東西：

for (i=0; i< len("$@"); i+=2) { 
    print a[i], a[i+1] 
    // do stuff using the pair elements. 
} 

Answer 1

而非索引到$@，簡單（與POSIX兼容）的方法是簡單地關閉開始轉向東西你去：

while [ "$#" -gt 0 ]; do 
    echo "$1, $2" 
    shift; shift 
done 

如果你確實想指數代替，並且不介意被專用於由KSH率先殼（如bash）的採用擴展：

# start at 1 to avoid $0 
# quotes in immediately below line because SO syntax highlighter doesn't know bash 
for ((i=1; i<("$#" + 1); i+=2)); do 
    echo "${@:i:1}, ${@:i+1:1}" 
done