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ejemplos:scripting
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| Ambos lados, revisión anterior Revisión previa Próxima revisión | Revisión previa | ||
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ejemplos:scripting [2008/02/16 15:42] fmolinuevo |
ejemplos:scripting [2015/02/26 11:49] (actual) fmolinuevo [Script 4] |
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| Línea 1: | Línea 1: | ||
| ====== Scripting: ejemplos básicos ====== | ====== Scripting: ejemplos básicos ====== | ||
| + | //Nota//: The magical incantation '2>&1' has more meaning when it is considered that, when running in a UNIX or UNIX-like environment, each file opened (for reading or writing) is assigned a file descriptor number. By default, all commands have three file descriptors open as they run: STDIN (standard input), STDOUT (standard output), and STDERR (standard error). These are assigned the numbers 0, 1, and 2 respectively. So in the given syntax, '2' means standard error, '>' means '2' is being redirected, '&' means '1' is a file descriptor (and not a file named '1'), and '1' means standard output. The reason '2>&1' is specified after STDOUT is redirected to a file is that the command is read by the shell interpreter from left to right and descriptors are resolved immediately. If '2>&1' came first, STDERR would go to the original STDOUT (and not the file), which is not what I want here. | ||
| ===== Script 1 ===== | ===== Script 1 ===== | ||
| Línea 45: | Línea 46: | ||
| for i in joselo jose sergio alberto melisa felix | for i in joselo jose sergio alberto melisa felix | ||
| do | do | ||
| - | if [ $i == 'felix' ] | + | if [ $i = 'felix' ] |
| then | then | ||
| echo "$i es profe" | echo "$i es profe" | ||
ejemplos/scripting.1203183720.txt.gz · Última modificación: 2012/01/27 17:46 (editor externo)
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