FreeBSD 2.0 äëÿ ÷àéíèêîâ
Ïpè íàëè÷èè èäóùèõ ïîäpÿä ïóñòûõ
¦ ¦
¦ 1 Number 1 ¦
¦ 2 Number 2 ¦
¦ 3 Number 3 ¦
¦ 4 Number 4 ¦
¦ 5 ¦
¦ 6 ¦
¦ 7 Number 5 ¦
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7. Ïpè íàëè÷èè èäóùèõ ïîäpÿä ïóñòûõ ñòpîê âûâîäèòü òîëüêî îäíó.
---------------¬
¦ cat -s file1 ¦
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8. Âûâîäèòü ñèìâîëû òàáóëÿöèè, êàê ^I:
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¦ cat -t file1 ¦
+--------------+
¦ Number 1 ¦
¦ ^INumber 2 ¦
¦ ^INumber 3 ¦
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14.6. Êîìàíäà ECHO.
Ïîçíàêîìèìñÿ åùå ñ îäíîé êîìàíäîé, àíàëîã êîòîpîé èìååòñÿ â DOS-ñèòåìàõ.
Ýòî êîìàíäà "echo" (ýõî).
Îíà èìååò ôîpìàò:
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¦ echo [-n] [arg ...] ¦
¦ ¦
¦ /bin/echo [ arg ] ... ¦
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Êîìàíäà "echo" âûâîäèò íà óñòðîéñòâî ñòàíäàðòíîãî âûâîäà çàäàííûå åé àðãó-
ìåíòû, ðàçäåëÿÿ èõ ïðîáåëàìè è çàâåðøàÿ èõ ñèìâîëîì íîâîé ñòðîêè (\n).
Ýòà êîìàíäà óäîáíà äëÿ ôîðìèðîâàíèÿ äèàãíîñòè÷åñêèõ ñîîáùåíèé â êîìàíäíûõ
ôàéëàõ è äëÿ ïåðåäà÷è èçâåñòíûõ äàííûõ â ïðîãðàììíîì êàíàëå.
Âîçìîæåí ïàðàìåòð:
-n Íå âûâîäèòü çàâåpøaþùèé ñèìâîë ïåðåâîäà ñòðîêè.
