ソフトウェアエンジニアの技術ブログ：Software engineer tech blog

#!/bin/sh

for var in 0 1 2 3 4
do
	echo $var
done

[vagrant@localhost tests]$ sed -i ‘s/\r//’ test.sh
[vagrant@localhost tests]$ ./test.sh
0
1
2
3
4

{0..5}とも書ける。」

#!/bin/sh

for var in {0..5}
do
	echo $var
done

function

#!/bin/sh

MyFunction(){
	echo "display function"
}
MyParamFunc(){
	echo "parm1:$1 param2:$2"
}

MyFunction
MyParamFunc 5 4

[vagrant@localhost tests]$ sed -i ‘s/\r//’ test.sh
[vagrant@localhost tests]$ ./test.sh
display function
parm1:5 param2:4

with linux command

#!/bin/sh

index=1
for file in *.txt
do
	mv "$file" "mytxt${index}.txt"
	index=`expr $index + 1`
done

[vagrant@localhost tests]$ sed -i ‘s/\r//’ test.sh
[vagrant@localhost tests]$ ./test.sh

すげええええええええええええええええええええええええ

#!/bin/sh

a=0
while [ $a -lt 5 ]
do
	echo $a
	a=`expr $a + 1`
done

[vagrant@localhost tests]$ sed -i ‘s/\r//’ test.sh
[vagrant@localhost tests]$ ./test.sh
0
1
2
3
4

‘と`の違いで手古摺った.

#!/bin/sh

a=0
until [ ! $a -lt 5 ]
do
	echo $a
	a=`expr $a + 1`
done

#!/bin/sh

DRINK="beer"
case "$DRINK" in
	"beer") echo "this is beer"
	;;
	"juice") echo "that is juice"
	;;
	"coak") echo "Do not drink it"
	;;
esac

[vagrant@localhost tests]$ sed -i ‘s/\r//’ test.sh
[vagrant@localhost tests]$ ./test.sh
this is beer

esacとか、使い慣れてないなー

#!/bin/sh

if [ "$1" -gt "$2" ]
then
	echo "1番目の引数が2番目の引数より大きい"
elif [ "$1" -eq "$2" ]
then
	echo "1番目の引数と2番目の引数は同じです"
else
	echo "1番目の引数が2番目の引数より小さい"
fi

[vagrant@localhost tests]$ sed -i ‘s/\r//’ test.sh
[vagrant@localhost tests]$ ./test.sh 5 4
1番目の引数が2番目の引数より大きい

Variable Function
$0 script name
Access $1 ～ $9 arguments, $1 for the first argument, $2 for the second argument

$ # number of arguments given to the script
$ * treat all arguments together as one
$ @ Thread all arguments as separate
$? End value of the last executed command (0 is success, 1 is failure)
$$ Process ID of this shell script
$! last executed background process ID

#!/bin/sh

echo "\$0 (スクリプト名)：　$0"
echo "\$1 (1番目の引数)：　$1"
echo "\$2 (2番目の引数)：　$2"
echo "\$# (引数の数)：　$#"
echo "\"\$*\": \"$*\""
echo "\"\$@\": \"$@\""
VAR="exit値は0になるはずです"
echo $?

[vagrant@localhost tests]$ sed -i ‘s/\r//’ test.sh
[vagrant@localhost tests]$ ./test.sh
$0 (スクリプト名)：　./test.sh
$1 (1番目の引数)：　
$2 (2番目の引数)：　
$# (引数の数)：　0
“$*”: “”
“$@”: “”
0

Can use single-byte alphanumeric characers and underscores as variable name. a to z, A to Z, 0 to 9 and _.
When giving a value to a variable, write = without leading and trailing blanks. If it is a string, enclose it in “.
Put $ before the variable name when accessing the variable. or put $ and enclose the variable in {}.
Only one value can be stored in one variable.
Use readonly to not overwrite the value of the variable. Variables can be deleted by unset. (You can not delete the readonly variable.)

#!/bin/sh

var="yukijirushi"
var2="coffee"
echo "I'm drinking $var2"

[vagrant@localhost tests]$ sed -i ‘s/\r//’ test.sh
[vagrant@localhost tests]$ ./test.sh
I’m drinking coffee

なるほど。

#!/bin/sh

var="yukijirushi"
var2="coffee"
echo "I'm drinking $var2"

var2="traditional test"
echo ${var2}

[vagrant@localhost tests]$ sed -i ‘s/\r//’ test.sh
[vagrant@localhost tests]$ ./test.sh
I’m drinking coffee
traditional test

ここまでは簡単

Shell script is simply to execute Unix command etc. side by side. It is responsible for when to execute what instruction and what condition, read file contents, and write log file.

#!/bin/sh

echo "Hello, World!"

[vagrant@localhost tests]$ chmod 755 test.sh
[vagrant@localhost tests]$ ./test.sh
-bash: ./test.sh: /bin/sh^M: bad interpreter: そのようなファイルやディレクトリはありません
[vagrant@localhost tests]$ sed -i ‘s/\r//’ test.sh
sed: -e 表現 #1, 文字数 1: 未知のコマンドです: 「▒」
[vagrant@localhost tests]$ ./test.sh
-bash: ./test.sh: /bin/sh^M: bad interpreter: そのようなファイルやディレクトリはありません
[vagrant@localhost tests]$ sed -i ‘s/\r//’ test.sh
[vagrant@localhost tests]$ ./test.sh
Hello, World!

#!/bin/sh


# コメントです。
read NAME
echo "Hello, $NAME!"

あれ、コマンドラインが止まる？　なんでだろう。。