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error of unix redirecting command called by java

error of unix redirecting command called by java# Java - 爪哇娇娃

B*g2008-10-14 07:10

1 楼

【以下文字转载自 Database 讨论区】
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A*a2008-10-14 07:10

2 楼

Process p = Runtime.getRuntime("cat /users/test/file1.txt /users/test/file2.
txt > /users/test/file3.txt").exec;
It reports an error like this:
cat: /users/test/file3.txt: No such file or directory
it seems it is the redirecting ">" symbol makes problem.
can anyone help here?! thanks.

g*g2008-10-14 07:10

3 楼

The trick is to use a script to put down your command,
then use java to call that script.

file2.

【在 A******a 的大作中提到】

: Process p = Runtime.getRuntime("cat /users/test/file1.txt /users/test/file2.
: txt > /users/test/file3.txt").exec;
: It reports an error like this:
: cat: /users/test/file3.txt: No such file or directory
: it seems it is the redirecting ">" symbol makes problem.
: can anyone help here?! thanks.

Z*e2008-10-14 07:10

4 楼

or use getOutputStream of Process class if more control is desired, but that
generally requires writing a thread to read the output

【在 g*****g 的大作中提到】

: The trick is to use a script to put down your command,
: then use java to call that script.
:
: file2.

z*h2008-10-14 07:10

5 楼

should it be
Runtime.getRuntime().exec("cat ... ");
?

file2.

【在 A******a 的大作中提到】

A*a2008-10-14 07:10

6 楼

Thanks! yes, that is one solution. another one is here, need to write the
command as a string array and tell the shell dir clearly:
http://www.unix.com.ua/orelly/java-ent/servlet/ch13_04.htm
"
String[] command = { "/bin/csh", "-c", "finger | grep -v jhunter" };
The program Java executes is /bin/csh. csh is passed two arguments: -c,
which asks the shell to execute the next parameter, and finger | grep -v
jhunter, which is executed by the shell."

【在 g*****g 的大作中提到】

: The trick is to use a script to put down your command,
: then use java to call that script.
:
: file2.