Redirect java -version to file or variable
6
Maybe it is a silly question, but I'm trying to redirect the exit of "java -version" command to a file or variable but it doesn't work.
Server = Linux CentOS 6
My code in shell script
java -version >> test.txt
Also I'm trying to assign it to a variable:
JAVA_CHECK=`java -version`
Even running those command from command-line it still not working.
when I say it doesnt work, I mean that the exit of the command is being showed in my screen instead to redirect it to a file or wherever
...
java linux variables redirect command
asked Jan 30 '14 at 10:25
SallyerikSallyerik
175616
add a comment |
6
Maybe it is a silly question, but I'm trying to redirect the exit of "java -version" command to a file or variable but it doesn't work.
Server = Linux CentOS 6
My code in shell script
java -version >> test.txt
Also I'm trying to assign it to a variable:
JAVA_CHECK=`java -version`
Even running those command from command-line it still not working.
when I say it doesnt work, I mean that the exit of the command is being showed in my screen instead to redirect it to a file or wherever
...
java linux variables redirect command
asked Jan 30 '14 at 10:25
SallyerikSallyerik
175616
its a good question - this is happening on windows too
– user1428716
Jan 30 '14 at 10:31
add a comment |
6
6
6
Maybe it is a silly question, but I'm trying to redirect the exit of "java -version" command to a file or variable but it doesn't work.
Server = Linux CentOS 6
My code in shell script
java -version >> test.txt
Also I'm trying to assign it to a variable:
JAVA_CHECK=`java -version`
Even running those command from command-line it still not working.
when I say it doesnt work, I mean that the exit of the command is being showed in my screen instead to redirect it to a file or wherever
...
java linux variables redirect command
asked Jan 30 '14 at 10:25
SallyerikSallyerik
175616
Maybe it is a silly question, but I'm trying to redirect the exit of "java -version" command to a file or variable but it doesn't work.
Server = Linux CentOS 6
My code in shell script
java -version >> test.txt
Also I'm trying to assign it to a variable:
JAVA_CHECK=`java -version`
Even running those command from command-line it still not working.
when I say it doesnt work, I mean that the exit of the command is being showed in my screen instead to redirect it to a file or wherever
...
java linux variables redirect command
java linux variables redirect command
asked Jan 30 '14 at 10:25
SallyerikSallyerik
175616
asked Jan 30 '14 at 10:25
SallyerikSallyerik
175616
asked Jan 30 '14 at 10:25
SallyerikSallyerik
175616
asked Jan 30 '14 at 10:25
SallyerikSallyerik
175616
asked Jan 30 '14 at 10:25
SallyerikSallyerik
175616
175616
its a good question - this is happening on windows too
– user1428716
Jan 30 '14 at 10:31
add a comment |
its a good question - this is happening on windows too
– user1428716
Jan 30 '14 at 10:31
its a good question - this is happening on windows too
– user1428716
Jan 30 '14 at 10:31
its a good question - this is happening on windows too
– user1428716
Jan 30 '14 at 10:31
add a comment |
1 Answer
1
active
oldest
votes
10
java -version writes to stderr (fileno 2), not stdout (fileno 1). You can redirect stderr to a file:
java -version 2> test.txt
# cat test.txt
# java version "1.7.0_25"
# OpenJDK Runtime Environment
# [...]
Or you can redirect stderr to stdout:
java_check=$(java -version 2>&1)
# echo "$java_check"
# java version "1.7.0_25" OpenJDK Runtime Environment [...]
edited Nov 15 '18 at 11:14
tripleee
93.6k13130185
answered Jan 30 '14 at 10:27
Nigel TufnelNigel Tufnel
8,14812628
Great it works!!. But I dont undestand why Java writes to sterr instead to stdout. And other weird issue happed when I try to assign the variable command within my shell scrip, it's works, I mean it's doing well the redirection but it's feeding my variale with "Error: Could not find or load main class version"
– Sallyerik
Jan 30 '14 at 10:56
Probably you forgot the dash before the version:java versionwill try to run a class namedversion
– Nigel Tufnel
Jan 30 '14 at 11:00
Unfortunately not, the dash still there, I've copied and pasted the comand. It's prety corious because 2> test.txt works but 2>&1 shows the error.
– Sallyerik
Jan 30 '14 at 11:06
Fascinating! Which shell are you using? Works for me on ubuntu/bash.
– Nigel Tufnel
Jan 30 '14 at 11:12
Well yes it's. I'm using CentOS/bash.
– Sallyerik
Jan 31 '14 at 9:26
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
10
java -version writes to stderr (fileno 2), not stdout (fileno 1). You can redirect stderr to a file:
java -version 2> test.txt
# cat test.txt
# java version "1.7.0_25"
# OpenJDK Runtime Environment
# [...]
Or you can redirect stderr to stdout:
java_check=$(java -version 2>&1)
# echo "$java_check"
# java version "1.7.0_25" OpenJDK Runtime Environment [...]
edited Nov 15 '18 at 11:14
tripleee
93.6k13130185
answered Jan 30 '14 at 10:27
Nigel TufnelNigel Tufnel
8,14812628
Great it works!!. But I dont undestand why Java writes to sterr instead to stdout. And other weird issue happed when I try to assign the variable command within my shell scrip, it's works, I mean it's doing well the redirection but it's feeding my variale with "Error: Could not find or load main class version"
– Sallyerik
Jan 30 '14 at 10:56
Probably you forgot the dash before the version:java versionwill try to run a class namedversion
– Nigel Tufnel
Jan 30 '14 at 11:00
Unfortunately not, the dash still there, I've copied and pasted the comand. It's prety corious because 2> test.txt works but 2>&1 shows the error.
– Sallyerik
Jan 30 '14 at 11:06
Fascinating! Which shell are you using? Works for me on ubuntu/bash.
– Nigel Tufnel
Jan 30 '14 at 11:12
Well yes it's. I'm using CentOS/bash.
– Sallyerik
Jan 31 '14 at 9:26
add a comment |
10
java -version writes to stderr (fileno 2), not stdout (fileno 1). You can redirect stderr to a file:
java -version 2> test.txt
# cat test.txt
# java version "1.7.0_25"
# OpenJDK Runtime Environment
# [...]
Or you can redirect stderr to stdout:
java_check=$(java -version 2>&1)
# echo "$java_check"
# java version "1.7.0_25" OpenJDK Runtime Environment [...]
edited Nov 15 '18 at 11:14
tripleee
93.6k13130185
answered Jan 30 '14 at 10:27
Nigel TufnelNigel Tufnel
8,14812628
Great it works!!. But I dont undestand why Java writes to sterr instead to stdout. And other weird issue happed when I try to assign the variable command within my shell scrip, it's works, I mean it's doing well the redirection but it's feeding my variale with "Error: Could not find or load main class version"
– Sallyerik
Jan 30 '14 at 10:56
Probably you forgot the dash before the version:java versionwill try to run a class namedversion
– Nigel Tufnel
Jan 30 '14 at 11:00
Unfortunately not, the dash still there, I've copied and pasted the comand. It's prety corious because 2> test.txt works but 2>&1 shows the error.
– Sallyerik
Jan 30 '14 at 11:06
Fascinating! Which shell are you using? Works for me on ubuntu/bash.
– Nigel Tufnel
Jan 30 '14 at 11:12
Well yes it's. I'm using CentOS/bash.
– Sallyerik
Jan 31 '14 at 9:26
add a comment |
10
10
10
java -version writes to stderr (fileno 2), not stdout (fileno 1). You can redirect stderr to a file:
java -version 2> test.txt
# cat test.txt
# java version "1.7.0_25"
# OpenJDK Runtime Environment
# [...]
Or you can redirect stderr to stdout:
java_check=$(java -version 2>&1)
# echo "$java_check"
# java version "1.7.0_25" OpenJDK Runtime Environment [...]
edited Nov 15 '18 at 11:14
tripleee
93.6k13130185
answered Jan 30 '14 at 10:27
Nigel TufnelNigel Tufnel
8,14812628
java -version writes to stderr (fileno 2), not stdout (fileno 1). You can redirect stderr to a file:
java -version 2> test.txt
# cat test.txt
# java version "1.7.0_25"
# OpenJDK Runtime Environment
# [...]
Or you can redirect stderr to stdout:
java_check=$(java -version 2>&1)
# echo "$java_check"
# java version "1.7.0_25" OpenJDK Runtime Environment [...]
edited Nov 15 '18 at 11:14
tripleee
93.6k13130185
answered Jan 30 '14 at 10:27
Nigel TufnelNigel Tufnel
8,14812628
edited Nov 15 '18 at 11:14
tripleee
93.6k13130185
edited Nov 15 '18 at 11:14
tripleee
93.6k13130185
edited Nov 15 '18 at 11:14
tripleee
93.6k13130185
93.6k13130185
answered Jan 30 '14 at 10:27
Nigel TufnelNigel Tufnel
8,14812628
answered Jan 30 '14 at 10:27
Nigel TufnelNigel Tufnel
8,14812628
answered Jan 30 '14 at 10:27
Nigel TufnelNigel Tufnel
8,14812628
8,14812628
Great it works!!. But I dont undestand why Java writes to sterr instead to stdout. And other weird issue happed when I try to assign the variable command within my shell scrip, it's works, I mean it's doing well the redirection but it's feeding my variale with "Error: Could not find or load main class version"
– Sallyerik
Jan 30 '14 at 10:56
Probably you forgot the dash before the version:java versionwill try to run a class namedversion
– Nigel Tufnel
Jan 30 '14 at 11:00
Unfortunately not, the dash still there, I've copied and pasted the comand. It's prety corious because 2> test.txt works but 2>&1 shows the error.
– Sallyerik
Jan 30 '14 at 11:06
Fascinating! Which shell are you using? Works for me on ubuntu/bash.
– Nigel Tufnel
Jan 30 '14 at 11:12
Well yes it's. I'm using CentOS/bash.
– Sallyerik
Jan 31 '14 at 9:26
add a comment |
Great it works!!. But I dont undestand why Java writes to sterr instead to stdout. And other weird issue happed when I try to assign the variable command within my shell scrip, it's works, I mean it's doing well the redirection but it's feeding my variale with "Error: Could not find or load main class version"
– Sallyerik
Jan 30 '14 at 10:56
Probably you forgot the dash before the version:java versionwill try to run a class namedversion
– Nigel Tufnel
Jan 30 '14 at 11:00
Unfortunately not, the dash still there, I've copied and pasted the comand. It's prety corious because 2> test.txt works but 2>&1 shows the error.
– Sallyerik
Jan 30 '14 at 11:06
Fascinating! Which shell are you using? Works for me on ubuntu/bash.
– Nigel Tufnel
Jan 30 '14 at 11:12
Well yes it's. I'm using CentOS/bash.
– Sallyerik
Jan 31 '14 at 9:26
Great it works!!. But I dont undestand why Java writes to sterr instead to stdout. And other weird issue happed when I try to assign the variable command within my shell scrip, it's works, I mean it's doing well the redirection but it's feeding my variale with "Error: Could not find or load main class version"
– Sallyerik
Jan 30 '14 at 10:56
Great it works!!. But I dont undestand why Java writes to sterr instead to stdout. And other weird issue happed when I try to assign the variable command within my shell scrip, it's works, I mean it's doing well the redirection but it's feeding my variale with "Error: Could not find or load main class version"
– Sallyerik
Jan 30 '14 at 10:56
Probably you forgot the dash before the version:
java version will try to run a class named version– Nigel Tufnel
Jan 30 '14 at 11:00
Probably you forgot the dash before the version:
java version will try to run a class named version– Nigel Tufnel
Jan 30 '14 at 11:00
Unfortunately not, the dash still there, I've copied and pasted the comand. It's prety corious because 2> test.txt works but 2>&1 shows the error.
– Sallyerik
Jan 30 '14 at 11:06
Unfortunately not, the dash still there, I've copied and pasted the comand. It's prety corious because 2> test.txt works but 2>&1 shows the error.
– Sallyerik
Jan 30 '14 at 11:06
Fascinating! Which shell are you using? Works for me on ubuntu/bash.
– Nigel Tufnel
Jan 30 '14 at 11:12
Fascinating! Which shell are you using? Works for me on ubuntu/bash.
– Nigel Tufnel
Jan 30 '14 at 11:12
Well yes it's. I'm using CentOS/bash.
– Sallyerik
Jan 31 '14 at 9:26
Well yes it's. I'm using CentOS/bash.
– Sallyerik
Jan 31 '14 at 9:26
add a comment |
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its a good question - this is happening on windows too
– user1428716
Jan 30 '14 at 10:31