Use grep and cut inside a bash function
i have the following bash code:
function ()
curl="$(curl -s "$2" >> "$1")"
version="$(grep '$3' $1
function "test" "https://google.com" "String" "cut -d' ' -f3 | cut -d'<' -f1"
Basically the function downloads the page and then uses grep to look for a specific string. After that "cut", cuts down the results further. But ... unfortenatly the cut inside the function doesn't work. I only get the following output:
"usage: cut -b list [-n] [file ...]
cut -c list [file ...]
cut -f list [-s] [-d delim] [file ...]"
Maybe i overlooked something ... or maybe you have a better idea :-)
bash function curl grep cut
asked Nov 12 at 19:23
Stfn
62
add a comment |
i have the following bash code:
function ()
curl="$(curl -s "$2" >> "$1")"
version="$(grep '$3' $1
function "test" "https://google.com" "String" "cut -d' ' -f3 | cut -d'<' -f1"
Basically the function downloads the page and then uses grep to look for a specific string. After that "cut", cuts down the results further. But ... unfortenatly the cut inside the function doesn't work. I only get the following output:
"usage: cut -b list [-n] [file ...]
cut -c list [file ...]
cut -f list [-s] [-d delim] [file ...]"
Maybe i overlooked something ... or maybe you have a better idea :-)
bash function curl grep cut
asked Nov 12 at 19:23
Stfn
62
2
See: Difference between single and double quotes in bash
– Cyrus
Nov 12 at 19:25
1
functionis a bash builtin command/keyword. See:help
– Cyrus
Nov 12 at 19:27
1
I don't understand what you're trying to do withcurl="$(curl ...)", as you don't ever use thecurlvariable after that.
– Benjamin W.
Nov 12 at 20:52
yeah, there won't be anything in it anyway. stdout is redirected, and stderr won't be collected into the var.
– Paul Hodges
Nov 12 at 22:07
A yes the curl variable was nonse and the function isn't titled function of course. It was just for the posting here :)
– Stfn
Nov 13 at 6:55
add a comment |
i have the following bash code:
function ()
curl="$(curl -s "$2" >> "$1")"
version="$(grep '$3' $1
function "test" "https://google.com" "String" "cut -d' ' -f3 | cut -d'<' -f1"
Basically the function downloads the page and then uses grep to look for a specific string. After that "cut", cuts down the results further. But ... unfortenatly the cut inside the function doesn't work. I only get the following output:
"usage: cut -b list [-n] [file ...]
cut -c list [file ...]
cut -f list [-s] [-d delim] [file ...]"
Maybe i overlooked something ... or maybe you have a better idea :-)
bash function curl grep cut
asked Nov 12 at 19:23
Stfn
62
i have the following bash code:
function ()
curl="$(curl -s "$2" >> "$1")"
version="$(grep '$3' $1
function "test" "https://google.com" "String" "cut -d' ' -f3 | cut -d'<' -f1"
Basically the function downloads the page and then uses grep to look for a specific string. After that "cut", cuts down the results further. But ... unfortenatly the cut inside the function doesn't work. I only get the following output:
"usage: cut -b list [-n] [file ...]
cut -c list [file ...]
cut -f list [-s] [-d delim] [file ...]"
Maybe i overlooked something ... or maybe you have a better idea :-)
bash function curl grep cut
bash function curl grep cut
asked Nov 12 at 19:23
Stfn
62
asked Nov 12 at 19:23
Stfn
62
asked Nov 12 at 19:23
Stfn
62
asked Nov 12 at 19:23
Stfn
62
asked Nov 12 at 19:23
Stfn
62
62
2
See: Difference between single and double quotes in bash
– Cyrus
Nov 12 at 19:25
1
functionis a bash builtin command/keyword. See:help
– Cyrus
Nov 12 at 19:27
1
I don't understand what you're trying to do withcurl="$(curl ...)", as you don't ever use thecurlvariable after that.
– Benjamin W.
Nov 12 at 20:52
yeah, there won't be anything in it anyway. stdout is redirected, and stderr won't be collected into the var.
– Paul Hodges
Nov 12 at 22:07
A yes the curl variable was nonse and the function isn't titled function of course. It was just for the posting here :)
– Stfn
Nov 13 at 6:55
add a comment |
2
See: Difference between single and double quotes in bash
– Cyrus
Nov 12 at 19:25
1
functionis a bash builtin command/keyword. See:help
– Cyrus
Nov 12 at 19:27
1
I don't understand what you're trying to do withcurl="$(curl ...)", as you don't ever use thecurlvariable after that.
– Benjamin W.
Nov 12 at 20:52
yeah, there won't be anything in it anyway. stdout is redirected, and stderr won't be collected into the var.
– Paul Hodges
Nov 12 at 22:07
A yes the curl variable was nonse and the function isn't titled function of course. It was just for the posting here :)
– Stfn
Nov 13 at 6:55
2
2
See: Difference between single and double quotes in bash
– Cyrus
Nov 12 at 19:25
See: Difference between single and double quotes in bash
– Cyrus
Nov 12 at 19:25
1
1
function is a bash builtin command/keyword. See: help– Cyrus
Nov 12 at 19:27
function is a bash builtin command/keyword. See: help– Cyrus
Nov 12 at 19:27
1
1
I don't understand what you're trying to do with
curl="$(curl ...)", as you don't ever use the curl variable after that.– Benjamin W.
Nov 12 at 20:52
I don't understand what you're trying to do with
curl="$(curl ...)", as you don't ever use the curl variable after that.– Benjamin W.
Nov 12 at 20:52
yeah, there won't be anything in it anyway. stdout is redirected, and stderr won't be collected into the var.
– Paul Hodges
Nov 12 at 22:07
yeah, there won't be anything in it anyway. stdout is redirected, and stderr won't be collected into the var.
– Paul Hodges
Nov 12 at 22:07
A yes the curl variable was nonse and the function isn't titled function of course. It was just for the posting here :)
– Stfn
Nov 13 at 6:55
A yes the curl variable was nonse and the function isn't titled function of course. It was just for the posting here :)
– Stfn
Nov 13 at 6:55
add a comment |
1 Answer
1
active
oldest
votes
Since $4 contains shell metacharacters that aren't processed when expanding variables, you need to use eval to execute it.
Also, you need to put $3 in double quotes, not single quotes, otherwise the variable won't be expanded.
version="$(grep "$3" "$1" | eval "$4" )"
answered Nov 12 at 20:02
Barmar
419k34243344
add a comment |
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active
oldest
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oldest
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active
oldest
votes
Since $4 contains shell metacharacters that aren't processed when expanding variables, you need to use eval to execute it.
Also, you need to put $3 in double quotes, not single quotes, otherwise the variable won't be expanded.
version="$(grep "$3" "$1" | eval "$4" )"
answered Nov 12 at 20:02
Barmar
419k34243344
add a comment |
Since $4 contains shell metacharacters that aren't processed when expanding variables, you need to use eval to execute it.
Also, you need to put $3 in double quotes, not single quotes, otherwise the variable won't be expanded.
version="$(grep "$3" "$1" | eval "$4" )"
answered Nov 12 at 20:02
Barmar
419k34243344
add a comment |
Since $4 contains shell metacharacters that aren't processed when expanding variables, you need to use eval to execute it.
Also, you need to put $3 in double quotes, not single quotes, otherwise the variable won't be expanded.
version="$(grep "$3" "$1" | eval "$4" )"
answered Nov 12 at 20:02
Barmar
419k34243344
Since $4 contains shell metacharacters that aren't processed when expanding variables, you need to use eval to execute it.
Also, you need to put $3 in double quotes, not single quotes, otherwise the variable won't be expanded.
version="$(grep "$3" "$1" | eval "$4" )"
answered Nov 12 at 20:02
Barmar
419k34243344
answered Nov 12 at 20:02
Barmar
419k34243344
answered Nov 12 at 20:02
Barmar
419k34243344
answered Nov 12 at 20:02
Barmar
419k34243344
419k34243344
add a comment |
add a comment |
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2
See: Difference between single and double quotes in bash
– Cyrus
Nov 12 at 19:25
1
functionis a bash builtin command/keyword. See:help– Cyrus
Nov 12 at 19:27
1
I don't understand what you're trying to do with
curl="$(curl ...)", as you don't ever use thecurlvariable after that.– Benjamin W.
Nov 12 at 20:52
yeah, there won't be anything in it anyway. stdout is redirected, and stderr won't be collected into the var.
– Paul Hodges
Nov 12 at 22:07
A yes the curl variable was nonse and the function isn't titled function of course. It was just for the posting here :)
– Stfn
Nov 13 at 6:55