fold コマンド – 長い行を折り返す

foldコマンドは、長い行を指定した長さに合うように折り返すことができるコマンドです。

1 foldコマンドの利用例
2 参考

foldコマンドの利用例

長い行を折り返す
(オプションなし)

foldコマンドはデフォルトでは80文字で行を折り返します。

また、metaphysics.txtは、Aristotleの「Metaphysics」の最初の段落になります。

コマンド例

fold metaphysics.txt

1	fold metaphysics.txt

metaphysics.txt

"ALL men by nature desire to know. An indication of this is the delight we take in our senses; for even apart from their usefulness they are loved for themselves; and above all others the sense of sight. For not only with a view to action, but even when we are not going to do anything, we prefer seeing (one might say) to everything else. The reason is that this, most of all the senses, makes us know and brings to light many differences between things.

"ALL men by nature desire to know. An indication of this is the delight we take in our senses; for even apart from their usefulness they are loved for themselves; and above all others the sense of sight. For not only with a view to action, but even when we are not going to do anything, we prefer seeing (one might say) to everything else. The reason is that this, most of all the senses, makes us know and brings to light many differences between things.

実行結果

"ALL men by nature desire to know. An indication of this is the delight we take 
in our senses; for even apart from their usefulness they are loved for themselve
s; and above all others the sense of sight. For not only with a view to action, 
but even when we are not going to do anything, we prefer seeing (one might say) 
to everything else. The reason is that this, most of all the senses, makes us kn
ow and brings to light many differences between things.

"ALL men by nature desire to know. An indication of this is the delight we take

in our senses; for even apart from their usefulness they are loved for themselve

s; and above all others the sense of sight. For not only with a view to action,

but even when we are not going to do anything, we prefer seeing (one might say)

to everything else. The reason is that this, most of all the senses, makes us kn

ow and brings to light many differences between things.

バイト単位で折り返す
(-bオプション)

-bオプションで数字を指定すると、そのバイト単位で行を折り返します。
コマンド例では、headコマンドで最初の10行だけを表示しています。

コマンド例

fold -b5 metaphysics.txt | head

1	fold -b5 metaphysics.txt \| head

実行結果

"ALL 
men b
y nat
ure d
esire
 to k
now. 
An in
dicat
ion o

"ALL

men b

y nat

ure d

esire

to k

now.

An in

dicat

ion o

単語の境界で折り返すようにする
(-sオプション)

-sオプションを用いると単語の境界で折り返すようになります。

コマンド例

fold -s metaphysics.txt

1	fold -s metaphysics.txt

実行結果

"ALL men by nature desire to know. An indication of this is the delight we take 
in our senses; for even apart from their usefulness they are loved for 
themselves; and above all others the sense of sight. For not only with a view 
to action, but even when we are not going to do anything, we prefer seeing (one 
might say) to everything else. The reason is that this, most of all the senses, 
makes us know and brings to light many differences between things.

"ALL men by nature desire to know. An indication of this is the delight we take

in our senses; for even apart from their usefulness they are loved for

themselves; and above all others the sense of sight. For not only with a view

to action, but even when we are not going to do anything, we prefer seeing (one

might say) to everything else. The reason is that this, most of all the senses,

makes us know and brings to light many differences between things.

幅を指定
(-wオプション)

-wオプションで、行の最大幅を指定することができます。
また、行の最大幅はデフォルトでは80になります。

コマンド例

fold -w20 metaphysics.txt | head

1	fold -w20 metaphysics.txt \| head

実行結果

"ALL men by nature d
esire to know. An in
dication of this is 
the delight we take 
in our senses; for e
ven apart from their
 usefulness they are
 loved for themselve
s; and above all oth
ers the sense of sig