Echo (Unix)

echo
Typ softwarupříkaz, standardní UNIXová utilita či příkaz, příkaz MS-DOSu a CMD.EXE command
Některá data mohou pocházet z datové položky.

echo je v informatice nástroj pro výpis zadaného textu na standardní výstup. Často se používá ve skriptech pro výpis informativních hlášení. V systému DOS, Microsoft WindowsOS/2 je používán interpretem COMMAND.COM (resp. cmd.exe) pro dávkové soubory s příponou .BAT. V unixových systémech se jedná o spustitelný soubor (/bin/echo), avšak některé unixové shelly implementují příkaz echo jako interní funkci, která může mít odlišné chování (např. bash, csh – standardní verzi lze pak spustit výše uvedeným zápisem, tj. včetně cesty).

Unixové systémy

Standardní výpis

Za symbolem ‚$‘ je příkaz zadaný uživatelem/uživatelkou: Výpis textu „Zdravím vás“:

$ echo "Zdravím vás"
Zdravím vás

Zápis textu do souboru

Text „Zdravím vás“ je přesměrován do souboru (obsah souboru je přepsán):

$ echo "Zdravím vás" > pozdrav.txt
$ cat pozdrav.txt
Zdravím vás

Přidání textu do souboru

Zápis řetězce „Zdravím vás“ přidáním k obsahu souboru:

$ echo "Zdravím vás" > pozdrav.txt
$ echo "Zdravím vás" >> /tmp/pozdrav.txt
$ cat pozdrav.txt
Zdravím vás
Zdravím vás

DOS, Windows

Příkaz echo. jen odřádkuje, tj. je vynechán jeden řádek. Jinak se příkaz chová podobně, jako v unixových systémech. Používá se v dávkových souborech s příponou .BAT.

echo Ahoj světě!
Ahoj světe!
echo.

echo kuk
kuk

Externí odkazy

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