to call function file in script
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Script
#! /bin/bash # calculate-- kind of bc-alike tool scale=2 show_help() { #(a) cat << EOF a % b ＝餘數 a ^ b ＝a 的 b 次方 l(x)x ＝10 的 x 次方 e(x) ＝ e 的 x 次方 scale N ＝小數取兩位（預設為 2） EOF } if [ $# -gt 0 ]; then exec scriptbc "$@" fi echo "calculate-- help or quit?" /bin/echo -n "calculate> " #(b) while read cmd args # param is called cmd and args # (c) do case $cmd in quit | exit ) exit ;; help | ? ) show_help ;; scale ) scale=$args ;; * ) scriptbc -p $scale "$cmd" "$args" ;; esac /bin/echo -n "calculate> " done echo " " exit 0 -
Syntax
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(a) EOF 注意 indent 別縮排
cat << EOF EOF -
(b) /bin/echo -n ""
echo is /bin/echo -
(c) while-read loop
此迴圈是讓 /bin/echo -n "calculate> " 一直顯示。
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Function File called scriptbc
先確認 Path 目錄中 scriptbc 變數有指定路徑。 腳本以互動方式執行，如執行時指定參數，這些參數會轉轉給函式檔案做處理。
#!/bin/bash # bc # scriptbc if [ "$1" = -p ] ; then precision=$2 shift 2 else precision=2 fi bc -q -l << EOF scale=$precision $* quit EOF exit 0 -
Execution
✗ cd desktop ➜ desktop zsh 521a.sh calculate-- help or quit? calculate> help a % b ＝餘數 a ^ b ＝a 的 b 次方 l(x)x ＝10 的 x 次方 e(x) ＝ e 的 x 次方 scale N ＝小數取兩位（預設為 2） calculate> ^D 521a.sh:42: command not found: scriptbc calculate> d6 521a.sh:42: command not found: scriptbc calculate> quit ➜ desktop