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3. 쥯ȥˤĤ(redirection)

bash ˤϡե뵭һ(file descriptor)Ȥơɸ (stdin)ɸ(stdout)ɸ२顼(stderr) 3 Ĥޤ ( std standard ΰ̣Ǥ)

˰ʲΤȤǤޤ

(쥯ȹʸǤ) 1 stdout ɽ 2 stderr ɽޤ

*嵭ιܤ줾ˤĤƤδñʥ* less ޥɤȤȡ stdout (ϥХåե˻Ĥޤ) stderr (꡼ˤ ɽޤΥХåե򸫤褦ȤȾõƤޤޤ)ξ򸫤 ȤǤޤ

硢ץ��νϤե˽񤭹ޤޤ

        $ ls -l > ls-l.txt

嵭Ǥ ls-l.txt Ȥե뤬ޤơ'ls -l' Ȥޥɤ¹Ԥ˥꡼ɽ ƤΥե¸ޤ

硢ץ�� stderr νϤե˽񤭹ޤޤ

website optimization company |Professional Link Building $ grep da * 2> grep-errors.txt

嵭Ǥϡgrep-errors.txt Ȥե뤬ޤơ Υեˤϡ'grep da *' νϤΤɼԤ褦ȤƤ Ϥ stderr ʬ񤭹ޤƤޤ

硢ץ�� stderr Ϥstdout Ʊ ե뵭һҤ˽񤭹ޤޤ

        $ grep da * 1>&2

嵭Ǥϡޥɤ stdout ʬ stderr ޤ ̤Τ뤳ȤɼԤϵդƤ뤫⤷ޤ

ξ硢ץ�� stderr Ϥstdout ƱΥե һҤ˽񤭹ޤޤ

        $ grep * 2>&1

嵭Ǥϡޥɤ stderr ʬ stdout ޤ äơ⤷ѥפȤä less ήС̾ʤ stderr ˽񤭹ޤƾäƤޤϤνϹԤ stdout 줿 ݻƤΤǧǤޤ

ξ硢ץ��ƤνϤեޤϡ ۤäƥޥɤ¹Ԥ褦 cron μ¹Թܤ񤯾Ŭ ޤ

        $ rm -f $(find / -name core) &> /dev/null

cron ץ��μ¹Թܤפ⤫٤ƤۤΤǤ嵭ϡ ǥ쥯ȥ꤫ "core" ȸƤФե򤹤٤ƺ ΤǤ ޥɤνϤ򸫤ʤƤޤϡΥޥɤɤ ΤʬǧƤʤФޤ