給shell裡的函式（function）傳遞引數有2種方式：

第一種方式：
在function裡直接通過$1,$2,etc.來獲取引數：

例：
建立一個檔案“file.txt”在shell裡建立一個函式並呼叫：

file.txt:

chen china engineer lee china leader lynn china programmer

funcTest.sh:

myfunc () { echo "params length: $#" #“$#”會顯示傳給該函式的引數個數 echo "all params : $@" #“$@”會顯示所有傳給函式的引數 echo "/$1: $1" echo "/$2: $2" echo "/$3: $3" echo "/$4: $4" echo "/$5: $5" echo "/$6: $6" echo "/$7: $7" echo "/$8: $8" echo "/$9: $9" echo "/$0: $0" } myfunc `grep china file.txt`

該shell的執行結果：

-bash-3.00$ ./funcTest.sh params length: 9 all params : chen china engineer lee china leader lynn china programmer $1: chen $2: china $3: engineer $4: lee $5: china $6: leader $7: lynn $8: china $9: programmer $0: ./funcTest.sh

從上面的結果可以看出通過這種傳遞方式grep結果裡的換行已經被無視了，本來應該是3行*3個引數，直接被當做9個引數了。

另外，$0在這裡指的是shell指令碼名。

第二種方式：

使用awk：

例：

myfunc2 () { awk '{ printf("$1:%s/n", $1) printf("$2:%s/n", $2) printf("$3:%s/n", $3) printf("$0:%s/n", $0) printf("-----------/n") }' } grep china file.txt|myfunc2

執行結果：

$1:chen $2:china $3:engineer $0:chen china engineer ----------- $1:lee $2:china $3:leader $0:lee china leader ----------- $1:lynn $2:china $3:programmer $0:lynn china programmer

可以看到，awk可以分3次進行處理，相當於呼叫了3遍myfunc2.

此外還有一點，$0在這裡指的是本次呼叫的所有引數。

注意點：

第一種方式不支援管道傳參，使用“grep china file.txt|myfunc”將得不到你想要的結果。

相反第二種方式（awk方式）只支援管道傳參，而不支援“myfunc2 `grep china file.txt`”的呼叫方式。

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提示：

Built-in Shell Variables：

$# : Number of command-line arguments.

$- : Options currently in effect (supplied on command line or to set). The shell sets some options automatically.

$? : Exit value of last executed command.

$$ : Process number of the shell.

$! : Process number of last background command.

$0 : First word; that is, the command name. This will have the full
     pathname if it was found via a PATH search.

$n : Individual arguments on command line (positional parameters).
     The Bourne shell allows only nine parameters to be referenced
     directly (n = 1–9); Bash allows n to be greater than 9
     if specified as ${n}.

$*, [email protected] : All arguments on command line ($1 $2 …).

"$*" : All arguments on command line as one string ("$1 $2…"). The
     values are separated by the first character in $IFS.

"[email protected]" : All arguments on command line, individually quoted ("$1" "$2" …).

$_ : Temporary variable; initialized to pathname
     of script or program being executed.
     Later, stores the last argument of previous
     command. Also stores name of matching
     MAIL file during mail checks.