How to convert a very small bash script into a single line command
I have a following bash script and it is being executed using popen(/path/to/script, 'r+') from C code and saving result back (Ex: DA00000);
for this, i need to export a bash script file.
But my requirement is that i should not use a seperate bash script.
Can you please let me know how to write below script in a single line itself as command?
So, i can use this command directly ( Ex:fp = popen(command "r")) in C code.
#!/bin/sh
url="$(grep 0x017a /sys/bus/pci/devices/*/device)"
addr="$(echo $url | cut -d/ -f6)"
str="$(head -n1 /sys/bus/pci/devices/$addr/resource | cut -d ' ' -f 1)"
result="${str:${#str} - 8}"
echo $result
shell-script
asked Feb 11 at 9:54
Seshagiri LekkalaSeshagiri Lekkala
154
add a comment |
I have a following bash script and it is being executed using popen(/path/to/script, 'r+') from C code and saving result back (Ex: DA00000);
for this, i need to export a bash script file.
But my requirement is that i should not use a seperate bash script.
Can you please let me know how to write below script in a single line itself as command?
So, i can use this command directly ( Ex:fp = popen(command "r")) in C code.
#!/bin/sh
url="$(grep 0x017a /sys/bus/pci/devices/*/device)"
addr="$(echo $url | cut -d/ -f6)"
str="$(head -n1 /sys/bus/pci/devices/$addr/resource | cut -d ' ' -f 1)"
result="${str:${#str} - 8}"
echo $result
shell-script
asked Feb 11 at 9:54
Seshagiri LekkalaSeshagiri Lekkala
154
1
I would suggest that you, instead of executing an external shell script, opened thedevicefiles directly and read from them with your C program.
– Kusalananda
Feb 11 at 10:04
But i have to read all devices to find exact match i.e. 0x017a since there are many device file are available.
– Seshagiri Lekkala
Feb 11 at 10:10
notice that your script is broken -- the/sys/bus/pice/devices/*/devicefiles do not contain any url or file name; you probably wantgrep -linstead.
– mosvy
Feb 11 at 10:30
add a comment |
I have a following bash script and it is being executed using popen(/path/to/script, 'r+') from C code and saving result back (Ex: DA00000);
for this, i need to export a bash script file.
But my requirement is that i should not use a seperate bash script.
Can you please let me know how to write below script in a single line itself as command?
So, i can use this command directly ( Ex:fp = popen(command "r")) in C code.
#!/bin/sh
url="$(grep 0x017a /sys/bus/pci/devices/*/device)"
addr="$(echo $url | cut -d/ -f6)"
str="$(head -n1 /sys/bus/pci/devices/$addr/resource | cut -d ' ' -f 1)"
result="${str:${#str} - 8}"
echo $result
shell-script
asked Feb 11 at 9:54
Seshagiri LekkalaSeshagiri Lekkala
154
I have a following bash script and it is being executed using popen(/path/to/script, 'r+') from C code and saving result back (Ex: DA00000);
for this, i need to export a bash script file.
But my requirement is that i should not use a seperate bash script.
Can you please let me know how to write below script in a single line itself as command?
So, i can use this command directly ( Ex:fp = popen(command "r")) in C code.
#!/bin/sh
url="$(grep 0x017a /sys/bus/pci/devices/*/device)"
addr="$(echo $url | cut -d/ -f6)"
str="$(head -n1 /sys/bus/pci/devices/$addr/resource | cut -d ' ' -f 1)"
result="${str:${#str} - 8}"
echo $result
shell-script
shell-script
asked Feb 11 at 9:54
Seshagiri LekkalaSeshagiri Lekkala
154
asked Feb 11 at 9:54
Seshagiri LekkalaSeshagiri Lekkala
154
edited Feb 11 at 10:02
Seshagiri Lekkala
asked Feb 11 at 9:54
Seshagiri LekkalaSeshagiri Lekkala
154
asked Feb 11 at 9:54
Seshagiri LekkalaSeshagiri Lekkala
154
asked Feb 11 at 9:54
Seshagiri LekkalaSeshagiri Lekkala
154
154
1
I would suggest that you, instead of executing an external shell script, opened thedevicefiles directly and read from them with your C program.
– Kusalananda
Feb 11 at 10:04
But i have to read all devices to find exact match i.e. 0x017a since there are many device file are available.
– Seshagiri Lekkala
Feb 11 at 10:10
notice that your script is broken -- the/sys/bus/pice/devices/*/devicefiles do not contain any url or file name; you probably wantgrep -linstead.
– mosvy
Feb 11 at 10:30
add a comment |
1
I would suggest that you, instead of executing an external shell script, opened thedevicefiles directly and read from them with your C program.
– Kusalananda
Feb 11 at 10:04
But i have to read all devices to find exact match i.e. 0x017a since there are many device file are available.
– Seshagiri Lekkala
Feb 11 at 10:10
notice that your script is broken -- the/sys/bus/pice/devices/*/devicefiles do not contain any url or file name; you probably wantgrep -linstead.
– mosvy
Feb 11 at 10:30
1
1
I would suggest that you, instead of executing an external shell script, opened the
device files directly and read from them with your C program.– Kusalananda
Feb 11 at 10:04
I would suggest that you, instead of executing an external shell script, opened the
device files directly and read from them with your C program.– Kusalananda
Feb 11 at 10:04
But i have to read all devices to find exact match i.e. 0x017a since there are many device file are available.
– Seshagiri Lekkala
Feb 11 at 10:10
But i have to read all devices to find exact match i.e. 0x017a since there are many device file are available.
– Seshagiri Lekkala
Feb 11 at 10:10
notice that your script is broken -- the
/sys/bus/pice/devices/*/device files do not contain any url or file name; you probably want grep -l instead.– mosvy
Feb 11 at 10:30
notice that your script is broken -- the
/sys/bus/pice/devices/*/device files do not contain any url or file name; you probably want grep -l instead.– mosvy
Feb 11 at 10:30
add a comment |
2 Answers
2
active
oldest
votes
You can convert your script to a C string and then pass that string directly to the popen(3) function.
Notice that popen(3) takes a script which will be passed as an argument to sh -c (and which can contain any valid shell commands) not just a program name or a command line.
Example:
$ perl -e '
print qq{char *script =n};
while(<>){
s/([-x1f"\x7f-xff])/sprintf "\x%02x",ord$1/ge;
print qq{t"$_"n}
}
print qq{;n}
' script.sh > script.h
$ cat script.h
char *script =
...
Then in your C file:
#include script.h
...
FILE *fh = popen(script, "r");
answered Feb 11 at 10:15
mosvymosvy
7,7321530
May i know how to convert into a C string without using Perl? because i may not be able to use perl also
– Seshagiri Lekkala
Feb 11 at 10:29
You can do it inC;-). I think that there are already programs likebin2cor such, that perl thing was a quick and dirty example.
– mosvy
Feb 11 at 10:31
but you would probably be better off by just doing the whole thing inC; that script is defective and overly complicated, anyway.
– mosvy
Feb 11 at 10:35
add a comment |
I come up with two pass:
first part (url+addr)
awk -F/ '/0x017a/ {print $6}' /sys/bus/pci/devices/*/device
second part
awk 'NR==1 { print substr($1,1,length($1)-8;}' /sys/bus/pci/devices/$addr/resource
I am not quiet sure this is a good way to address the problem.
answered Feb 11 at 10:19
ArchemarArchemar
20.2k93772
I executed above command but didnt work as expected.
– Seshagiri Lekkala
Feb 11 at 10:31
Your comment doesn't help me as expected.
– Archemar
Feb 11 at 10:33
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can convert your script to a C string and then pass that string directly to the popen(3) function.
Notice that popen(3) takes a script which will be passed as an argument to sh -c (and which can contain any valid shell commands) not just a program name or a command line.
Example:
$ perl -e '
print qq{char *script =n};
while(<>){
s/([-x1f"\x7f-xff])/sprintf "\x%02x",ord$1/ge;
print qq{t"$_"n}
}
print qq{;n}
' script.sh > script.h
$ cat script.h
char *script =
...
Then in your C file:
#include script.h
...
FILE *fh = popen(script, "r");
answered Feb 11 at 10:15
mosvymosvy
7,7321530
May i know how to convert into a C string without using Perl? because i may not be able to use perl also
– Seshagiri Lekkala
Feb 11 at 10:29
You can do it inC;-). I think that there are already programs likebin2cor such, that perl thing was a quick and dirty example.
– mosvy
Feb 11 at 10:31
but you would probably be better off by just doing the whole thing inC; that script is defective and overly complicated, anyway.
– mosvy
Feb 11 at 10:35
add a comment |
You can convert your script to a C string and then pass that string directly to the popen(3) function.
Notice that popen(3) takes a script which will be passed as an argument to sh -c (and which can contain any valid shell commands) not just a program name or a command line.
Example:
$ perl -e '
print qq{char *script =n};
while(<>){
s/([-x1f"\x7f-xff])/sprintf "\x%02x",ord$1/ge;
print qq{t"$_"n}
}
print qq{;n}
' script.sh > script.h
$ cat script.h
char *script =
...
Then in your C file:
#include script.h
...
FILE *fh = popen(script, "r");
answered Feb 11 at 10:15
mosvymosvy
7,7321530
May i know how to convert into a C string without using Perl? because i may not be able to use perl also
– Seshagiri Lekkala
Feb 11 at 10:29
You can do it inC;-). I think that there are already programs likebin2cor such, that perl thing was a quick and dirty example.
– mosvy
Feb 11 at 10:31
but you would probably be better off by just doing the whole thing inC; that script is defective and overly complicated, anyway.
– mosvy
Feb 11 at 10:35
add a comment |
You can convert your script to a C string and then pass that string directly to the popen(3) function.
Notice that popen(3) takes a script which will be passed as an argument to sh -c (and which can contain any valid shell commands) not just a program name or a command line.
Example:
$ perl -e '
print qq{char *script =n};
while(<>){
s/([-x1f"\x7f-xff])/sprintf "\x%02x",ord$1/ge;
print qq{t"$_"n}
}
print qq{;n}
' script.sh > script.h
$ cat script.h
char *script =
...
Then in your C file:
#include script.h
...
FILE *fh = popen(script, "r");
answered Feb 11 at 10:15
mosvymosvy
7,7321530
You can convert your script to a C string and then pass that string directly to the popen(3) function.
Notice that popen(3) takes a script which will be passed as an argument to sh -c (and which can contain any valid shell commands) not just a program name or a command line.
Example:
$ perl -e '
print qq{char *script =n};
while(<>){
s/([-x1f"\x7f-xff])/sprintf "\x%02x",ord$1/ge;
print qq{t"$_"n}
}
print qq{;n}
' script.sh > script.h
$ cat script.h
char *script =
...
Then in your C file:
#include script.h
...
FILE *fh = popen(script, "r");
answered Feb 11 at 10:15
mosvymosvy
7,7321530
edited Feb 11 at 11:00
answered Feb 11 at 10:15
mosvymosvy
7,7321530
answered Feb 11 at 10:15
mosvymosvy
7,7321530
answered Feb 11 at 10:15
mosvymosvy
7,7321530
7,7321530
May i know how to convert into a C string without using Perl? because i may not be able to use perl also
– Seshagiri Lekkala
Feb 11 at 10:29
You can do it inC;-). I think that there are already programs likebin2cor such, that perl thing was a quick and dirty example.
– mosvy
Feb 11 at 10:31
but you would probably be better off by just doing the whole thing inC; that script is defective and overly complicated, anyway.
– mosvy
Feb 11 at 10:35
add a comment |
May i know how to convert into a C string without using Perl? because i may not be able to use perl also
– Seshagiri Lekkala
Feb 11 at 10:29
You can do it inC;-). I think that there are already programs likebin2cor such, that perl thing was a quick and dirty example.
– mosvy
Feb 11 at 10:31
but you would probably be better off by just doing the whole thing inC; that script is defective and overly complicated, anyway.
– mosvy
Feb 11 at 10:35
May i know how to convert into a C string without using Perl? because i may not be able to use perl also
– Seshagiri Lekkala
Feb 11 at 10:29
May i know how to convert into a C string without using Perl? because i may not be able to use perl also
– Seshagiri Lekkala
Feb 11 at 10:29
You can do it in
C ;-). I think that there are already programs like bin2c or such, that perl thing was a quick and dirty example.– mosvy
Feb 11 at 10:31
You can do it in
C ;-). I think that there are already programs like bin2c or such, that perl thing was a quick and dirty example.– mosvy
Feb 11 at 10:31
but you would probably be better off by just doing the whole thing in
C; that script is defective and overly complicated, anyway.– mosvy
Feb 11 at 10:35
but you would probably be better off by just doing the whole thing in
C; that script is defective and overly complicated, anyway.– mosvy
Feb 11 at 10:35
add a comment |
I come up with two pass:
first part (url+addr)
awk -F/ '/0x017a/ {print $6}' /sys/bus/pci/devices/*/device
second part
awk 'NR==1 { print substr($1,1,length($1)-8;}' /sys/bus/pci/devices/$addr/resource
I am not quiet sure this is a good way to address the problem.
answered Feb 11 at 10:19
ArchemarArchemar
20.2k93772
I executed above command but didnt work as expected.
– Seshagiri Lekkala
Feb 11 at 10:31
Your comment doesn't help me as expected.
– Archemar
Feb 11 at 10:33
add a comment |
I come up with two pass:
first part (url+addr)
awk -F/ '/0x017a/ {print $6}' /sys/bus/pci/devices/*/device
second part
awk 'NR==1 { print substr($1,1,length($1)-8;}' /sys/bus/pci/devices/$addr/resource
I am not quiet sure this is a good way to address the problem.
answered Feb 11 at 10:19
ArchemarArchemar
20.2k93772
I executed above command but didnt work as expected.
– Seshagiri Lekkala
Feb 11 at 10:31
Your comment doesn't help me as expected.
– Archemar
Feb 11 at 10:33
add a comment |
I come up with two pass:
first part (url+addr)
awk -F/ '/0x017a/ {print $6}' /sys/bus/pci/devices/*/device
second part
awk 'NR==1 { print substr($1,1,length($1)-8;}' /sys/bus/pci/devices/$addr/resource
I am not quiet sure this is a good way to address the problem.
answered Feb 11 at 10:19
ArchemarArchemar
20.2k93772
I come up with two pass:
first part (url+addr)
awk -F/ '/0x017a/ {print $6}' /sys/bus/pci/devices/*/device
second part
awk 'NR==1 { print substr($1,1,length($1)-8;}' /sys/bus/pci/devices/$addr/resource
I am not quiet sure this is a good way to address the problem.
answered Feb 11 at 10:19
ArchemarArchemar
20.2k93772
answered Feb 11 at 10:19
ArchemarArchemar
20.2k93772
answered Feb 11 at 10:19
ArchemarArchemar
20.2k93772
answered Feb 11 at 10:19
ArchemarArchemar
20.2k93772
20.2k93772
I executed above command but didnt work as expected.
– Seshagiri Lekkala
Feb 11 at 10:31
Your comment doesn't help me as expected.
– Archemar
Feb 11 at 10:33
add a comment |
I executed above command but didnt work as expected.
– Seshagiri Lekkala
Feb 11 at 10:31
Your comment doesn't help me as expected.
– Archemar
Feb 11 at 10:33
I executed above command but didnt work as expected.
– Seshagiri Lekkala
Feb 11 at 10:31
I executed above command but didnt work as expected.
– Seshagiri Lekkala
Feb 11 at 10:31
Your comment doesn't help me as expected.
– Archemar
Feb 11 at 10:33
Your comment doesn't help me as expected.
– Archemar
Feb 11 at 10:33
add a comment |
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1
I would suggest that you, instead of executing an external shell script, opened the
devicefiles directly and read from them with your C program.– Kusalananda
Feb 11 at 10:04
But i have to read all devices to find exact match i.e. 0x017a since there are many device file are available.
– Seshagiri Lekkala
Feb 11 at 10:10
notice that your script is broken -- the
/sys/bus/pice/devices/*/devicefiles do not contain any url or file name; you probably wantgrep -linstead.– mosvy
Feb 11 at 10:30