What is uname-r | grep fc?
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I was reading a .sh file and find a line written as
if[ "`uname -r | grep fc`" == " " ]; then
But I don't find the meaning of fc and the whole expression.
I am using Ubuntu 16.04 LTS.
Thanks in Advance.
grep
asked Jun 2 at 4:24
Sanmveg saini
1042
add a comment |Â
up vote
0
down vote
favorite
I was reading a .sh file and find a line written as
if[ "`uname -r | grep fc`" == " " ]; then
But I don't find the meaning of fc and the whole expression.
I am using Ubuntu 16.04 LTS.
Thanks in Advance.
grep
asked Jun 2 at 4:24
Sanmveg saini
1042
Are the typos in that line made by you or are they from the script?
– muru
Jun 2 at 5:45
2
The command in the question can never evaluate totrue. Eitheruname -rcontains the lettersfc, in which casegrepoutputs that line. It is guaranteed to not equal a simple space character (as it has to contain at least the caracters "fc"). If, on the other hand,uname -rdoesn't contain "fc",grepwill output nothing which also is not equal to a single space. So both possible cases arefalse. That being said, can you please double check that you pasted the line exactly as written in the script, including all special characters and all spaces?
– Lienhart Woitok
Jun 2 at 7:26
1
Example :uname -r | grep fc→ 4.16.12-300. fc28 .x86_64. ... I.e. checking if the kernel is Fedora. Seems to be from a driver install script ubuntuforums.org/archive/index.php/t-2282796.html : "Realtek Wi-Fi driver Auto installationscript", "November, 21 2011 v1.1.0"
– Knud Larsen
Jun 2 at 8:09
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I was reading a .sh file and find a line written as
if[ "`uname -r | grep fc`" == " " ]; then
But I don't find the meaning of fc and the whole expression.
I am using Ubuntu 16.04 LTS.
Thanks in Advance.
grep
asked Jun 2 at 4:24
Sanmveg saini
1042
I was reading a .sh file and find a line written as
if[ "`uname -r | grep fc`" == " " ]; then
But I don't find the meaning of fc and the whole expression.
I am using Ubuntu 16.04 LTS.
Thanks in Advance.
grep
asked Jun 2 at 4:24
Sanmveg saini
1042
asked Jun 2 at 4:24
Sanmveg saini
1042
asked Jun 2 at 4:24
Sanmveg saini
1042
asked Jun 2 at 4:24
Sanmveg saini
1042
1042
Are the typos in that line made by you or are they from the script?
– muru
Jun 2 at 5:45
2
The command in the question can never evaluate totrue. Eitheruname -rcontains the lettersfc, in which casegrepoutputs that line. It is guaranteed to not equal a simple space character (as it has to contain at least the caracters "fc"). If, on the other hand,uname -rdoesn't contain "fc",grepwill output nothing which also is not equal to a single space. So both possible cases arefalse. That being said, can you please double check that you pasted the line exactly as written in the script, including all special characters and all spaces?
– Lienhart Woitok
Jun 2 at 7:26
1
Example :uname -r | grep fc→ 4.16.12-300. fc28 .x86_64. ... I.e. checking if the kernel is Fedora. Seems to be from a driver install script ubuntuforums.org/archive/index.php/t-2282796.html : "Realtek Wi-Fi driver Auto installationscript", "November, 21 2011 v1.1.0"
– Knud Larsen
Jun 2 at 8:09
add a comment |Â
Are the typos in that line made by you or are they from the script?
– muru
Jun 2 at 5:45
2
The command in the question can never evaluate totrue. Eitheruname -rcontains the lettersfc, in which casegrepoutputs that line. It is guaranteed to not equal a simple space character (as it has to contain at least the caracters "fc"). If, on the other hand,uname -rdoesn't contain "fc",grepwill output nothing which also is not equal to a single space. So both possible cases arefalse. That being said, can you please double check that you pasted the line exactly as written in the script, including all special characters and all spaces?
– Lienhart Woitok
Jun 2 at 7:26
1
Example :uname -r | grep fc→ 4.16.12-300. fc28 .x86_64. ... I.e. checking if the kernel is Fedora. Seems to be from a driver install script ubuntuforums.org/archive/index.php/t-2282796.html : "Realtek Wi-Fi driver Auto installationscript", "November, 21 2011 v1.1.0"
– Knud Larsen
Jun 2 at 8:09
Are the typos in that line made by you or are they from the script?
– muru
Jun 2 at 5:45
Are the typos in that line made by you or are they from the script?
– muru
Jun 2 at 5:45
2
2
The command in the question can never evaluate to
true. Either uname -r contains the letters fc, in which case grep outputs that line. It is guaranteed to not equal a simple space character (as it has to contain at least the caracters "fc"). If, on the other hand, uname -r doesn't contain "fc", grep will output nothing which also is not equal to a single space. So both possible cases are false. That being said, can you please double check that you pasted the line exactly as written in the script, including all special characters and all spaces?– Lienhart Woitok
Jun 2 at 7:26
The command in the question can never evaluate to
true. Either uname -r contains the letters fc, in which case grep outputs that line. It is guaranteed to not equal a simple space character (as it has to contain at least the caracters "fc"). If, on the other hand, uname -r doesn't contain "fc", grep will output nothing which also is not equal to a single space. So both possible cases are false. That being said, can you please double check that you pasted the line exactly as written in the script, including all special characters and all spaces?– Lienhart Woitok
Jun 2 at 7:26
1
1
Example :
uname -r | grep fc → 4.16.12-300. fc28 .x86_64. ... I.e. checking if the kernel is Fedora. Seems to be from a driver install script ubuntuforums.org/archive/index.php/t-2282796.html : "Realtek Wi-Fi driver Auto installationscript", "November, 21 2011 v1.1.0"– Knud Larsen
Jun 2 at 8:09
Example :
uname -r | grep fc → 4.16.12-300. fc28 .x86_64. ... I.e. checking if the kernel is Fedora. Seems to be from a driver install script ubuntuforums.org/archive/index.php/t-2282796.html : "Realtek Wi-Fi driver Auto installationscript", "November, 21 2011 v1.1.0"– Knud Larsen
Jun 2 at 8:09
add a comment |Â
1 Answer
1
active
oldest
votes
up vote
1
down vote
the special back tick char will return whatever is evaluated inside of the backticks. so uname -r | grep fc will return something only if your kernel release contains the letters fc. If no fc then it will just be the newline character. So the if statement will only evaluate to true when fc is not contained in your kernel string that is returned from uname. try doing
export a=`uname -r`
echo $a
as a test
answered Jun 2 at 5:17
oldITdude
111
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
the special back tick char will return whatever is evaluated inside of the backticks. so uname -r | grep fc will return something only if your kernel release contains the letters fc. If no fc then it will just be the newline character. So the if statement will only evaluate to true when fc is not contained in your kernel string that is returned from uname. try doing
export a=`uname -r`
echo $a
as a test
answered Jun 2 at 5:17
oldITdude
111
add a comment |Â
up vote
1
down vote
the special back tick char will return whatever is evaluated inside of the backticks. so uname -r | grep fc will return something only if your kernel release contains the letters fc. If no fc then it will just be the newline character. So the if statement will only evaluate to true when fc is not contained in your kernel string that is returned from uname. try doing
export a=`uname -r`
echo $a
as a test
answered Jun 2 at 5:17
oldITdude
111
add a comment |Â
up vote
1
down vote
up vote
1
down vote
the special back tick char will return whatever is evaluated inside of the backticks. so uname -r | grep fc will return something only if your kernel release contains the letters fc. If no fc then it will just be the newline character. So the if statement will only evaluate to true when fc is not contained in your kernel string that is returned from uname. try doing
export a=`uname -r`
echo $a
as a test
answered Jun 2 at 5:17
oldITdude
111
the special back tick char will return whatever is evaluated inside of the backticks. so uname -r | grep fc will return something only if your kernel release contains the letters fc. If no fc then it will just be the newline character. So the if statement will only evaluate to true when fc is not contained in your kernel string that is returned from uname. try doing
export a=`uname -r`
echo $a
as a test
answered Jun 2 at 5:17
oldITdude
111
answered Jun 2 at 5:17
oldITdude
111
answered Jun 2 at 5:17
oldITdude
111
answered Jun 2 at 5:17
oldITdude
111
111
add a comment |Â
add a comment |Â
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Are the typos in that line made by you or are they from the script?
– muru
Jun 2 at 5:45
2
The command in the question can never evaluate to
true. Eitheruname -rcontains the lettersfc, in which casegrepoutputs that line. It is guaranteed to not equal a simple space character (as it has to contain at least the caracters "fc"). If, on the other hand,uname -rdoesn't contain "fc",grepwill output nothing which also is not equal to a single space. So both possible cases arefalse. That being said, can you please double check that you pasted the line exactly as written in the script, including all special characters and all spaces?– Lienhart Woitok
Jun 2 at 7:26
1
Example :
uname -r | grep fc→ 4.16.12-300. fc28 .x86_64. ... I.e. checking if the kernel is Fedora. Seems to be from a driver install script ubuntuforums.org/archive/index.php/t-2282796.html : "Realtek Wi-Fi driver Auto installationscript", "November, 21 2011 v1.1.0"– Knud Larsen
Jun 2 at 8:09