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shellについて

Posted at
# 条件式
if [ cond1 ]; then
 # 処理1
elif [ cond2 ]; then
 # 処理2
else
 # 処理3
fi

# 結合
 # &&
if [ cond1 -a cond2 ]; then
fi
 # ||
if [ cond1 -o cond2 ]; then
fi
 # !
if [ ! cond1 ]; then
fi

# 数値比較
num1 -eq num2 # =
num1 -lt num2 # <
num1 -ne num2 # !=
num1 -le num2 # <=
num1 -ge num2 # >=
num1 -gt num2 # >

# 文字列比較
$1 = $2
$1 != $2
$1 < $2
-n $1 : is not null
-z $1 : is zero

# file
-d : directory
-b : binary
-e : exist
-r : readable
-o : owner
-G : group
-g : set gid bit
-L : symboliclink
file1 -nt file2 : new then (modifytime)
file1 -ot file2 : old then (modifytime)

# case 
case 変数 in
   パターン1) 処理;;
   パターン2) 処理;;
   パターン3 | パターン4) 処理;;
   *) 処理;;
esac

# Loop
 # while

a=0
while [ $a -ne 10 ]
do
  a=`expr $a + 1`
  echo "${a} 回目の処理"
done

while read line
do
  処理(${line}を処理)
done < ファイル

 # for
for i in 1 2 3;
do
 echo $i
done

# array
array=(`ls ./`);
array+=(elm1 elm2); # 追加

echo ${array[@]}; #全リストを表示
echo ${array[1]}; #2番目の要素を表示

for i in "${array[@]}";
do
	echo $i
done

echo "{#array[@]}"; # 要素数を参照

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