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3

I've been trying to learn to use jq and for bash it uses the <<< operator which I cannot understand after reading the bash documentation, what is this operator for?

Besides that, I use the fish shell instead. How can I translate jq . <<< '{"some": "xyz"}' (works in bash) to the fish shell?

bash io-redirection fish

share|improve this question

edited yesterday

Jeff Schaller♦

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asked Jul 6 '18 at 14:48

sant016sant016

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add a comment | 

3

I've been trying to learn to use jq and for bash it uses the <<< operator which I cannot understand after reading the bash documentation, what is this operator for?

Besides that, I use the fish shell instead. How can I translate jq . <<< '{"some": "xyz"}' (works in bash) to the fish shell?

bash io-redirection fish

share|improve this question

edited yesterday

Jeff Schaller♦

49k1111 gold badges7272 silver badges162162 bronze badges

asked Jul 6 '18 at 14:48

sant016sant016

2811 silver badge55 bronze badges

add a comment | 

I've been trying to learn to use jq and for bash it uses the <<< operator which I cannot understand after reading the bash documentation, what is this operator for?

Besides that, I use the fish shell instead. How can I translate jq . <<< '{"some": "xyz"}' (works in bash) to the fish shell?

bash io-redirection fish

share|improve this question

edited yesterday

Jeff Schaller♦

49k1111 gold badges7272 silver badges162162 bronze badges

asked Jul 6 '18 at 14:48

sant016sant016

2811 silver badge55 bronze badges

share|improve this question

edited yesterday

Jeff Schaller♦

49k1111 gold badges7272 silver badges162162 bronze badges

asked Jul 6 '18 at 14:48

sant016sant016

2811 silver badge55 bronze badges

share|improve this question

edited yesterday

Jeff Schaller♦

49k1111 gold badges7272 silver badges162162 bronze badges

asked Jul 6 '18 at 14:48

sant016sant016

2811 silver badge55 bronze badges

edited yesterday

Jeff Schaller♦

49k1111 gold badges7272 silver badges162162 bronze badges

edited yesterday

Jeff Schaller♦

49k1111 gold badges7272 silver badges162162 bronze badges

asked Jul 6 '18 at 14:48

sant016sant016

2811 silver badge55 bronze badges

asked Jul 6 '18 at 14:48

sant016sant016

2811 silver badge55 bronze badges

2 Answers
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4

The <<< operator is a here-string

3.6.7 Here Strings

Given:

[n]<<< word

The word undergoes brace expansion, tilde expansion, parameter and variable expansion, command substitution, arithmetic expansion, and quote removal. Pathname expansion and word splitting are not performed. The result is supplied as a single string, with a newline appended, to the command on its standard input (or file descriptor n if n is specified).

To translate this to fish shell you could likely do:

echo '{"some": "xyz"}' | jq

(which would work in bash as well)

share|improve this answer

edited yesterday

Kusalananda♦

160k1818 gold badges316316 silver badges502502 bronze badges

answered Jul 6 '18 at 14:55

Jesse_bJesse_b

18.7k33 gold badges4646 silver badges8686 bronze badges

add a comment | 

0

jq can accept text input as well, but by default, jq reads a stream of JSON entities [...] from stdin.

Therefore, you can type the input interactively using the keyboard. Use Ctrl+d to terminate the input (see also this explanation on SO). The main drawback is that you cannot use the usual keys e.g. ←, ↑, Ctrl+a.

prompt% jq -r '.[] | [ .string, .number|tostring ] | join(": ")' -

[{ "number": 9, "string": "nine"},

 { "number": 4, "string": "four"}]

nine: 9

four: 4

prompt%

Note: the command line comes from this SO answer.

share|improve this answer

edited yesterday

answered yesterday

FólkvangrFólkvangr

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add a comment | 

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4

The <<< operator is a here-string

3.6.7 Here Strings

Given:

[n]<<< word

The word undergoes brace expansion, tilde expansion, parameter and variable expansion, command substitution, arithmetic expansion, and quote removal. Pathname expansion and word splitting are not performed. The result is supplied as a single string, with a newline appended, to the command on its standard input (or file descriptor n if n is specified).

To translate this to fish shell you could likely do:

echo '{"some": "xyz"}' | jq

(which would work in bash as well)

share|improve this answer

edited yesterday

Kusalananda♦

160k1818 gold badges316316 silver badges502502 bronze badges

answered Jul 6 '18 at 14:55

Jesse_bJesse_b

18.7k33 gold badges4646 silver badges8686 bronze badges

add a comment | 

4

The <<< operator is a here-string

3.6.7 Here Strings

Given:

[n]<<< word

The word undergoes brace expansion, tilde expansion, parameter and variable expansion, command substitution, arithmetic expansion, and quote removal. Pathname expansion and word splitting are not performed. The result is supplied as a single string, with a newline appended, to the command on its standard input (or file descriptor n if n is specified).

To translate this to fish shell you could likely do:

echo '{"some": "xyz"}' | jq

(which would work in bash as well)

share|improve this answer

edited yesterday

Kusalananda♦

160k1818 gold badges316316 silver badges502502 bronze badges

answered Jul 6 '18 at 14:55

Jesse_bJesse_b

18.7k33 gold badges4646 silver badges8686 bronze badges

add a comment | 

The <<< operator is a here-string

3.6.7 Here Strings

Given:

[n]<<< word

The word undergoes brace expansion, tilde expansion, parameter and variable expansion, command substitution, arithmetic expansion, and quote removal. Pathname expansion and word splitting are not performed. The result is supplied as a single string, with a newline appended, to the command on its standard input (or file descriptor n if n is specified).

To translate this to fish shell you could likely do:

echo '{"some": "xyz"}' | jq

(which would work in bash as well)

share|improve this answer

edited yesterday

Kusalananda♦

160k1818 gold badges316316 silver badges502502 bronze badges

answered Jul 6 '18 at 14:55

Jesse_bJesse_b

18.7k33 gold badges4646 silver badges8686 bronze badges

[n]<<< word

echo '{"some": "xyz"}' | jq

share|improve this answer

edited yesterday

Kusalananda♦

160k1818 gold badges316316 silver badges502502 bronze badges

answered Jul 6 '18 at 14:55

Jesse_bJesse_b

18.7k33 gold badges4646 silver badges8686 bronze badges

edited yesterday

Kusalananda♦

160k1818 gold badges316316 silver badges502502 bronze badges

edited yesterday

Kusalananda♦

160k1818 gold badges316316 silver badges502502 bronze badges

answered Jul 6 '18 at 14:55

Jesse_bJesse_b

18.7k33 gold badges4646 silver badges8686 bronze badges

answered Jul 6 '18 at 14:55

Jesse_bJesse_b

18.7k33 gold badges4646 silver badges8686 bronze badges

0

jq can accept text input as well, but by default, jq reads a stream of JSON entities [...] from stdin.

Therefore, you can type the input interactively using the keyboard. Use Ctrl+d to terminate the input (see also this explanation on SO). The main drawback is that you cannot use the usual keys e.g. ←, ↑, Ctrl+a.

prompt% jq -r '.[] | [ .string, .number|tostring ] | join(": ")' -

[{ "number": 9, "string": "nine"},

 { "number": 4, "string": "four"}]

nine: 9

four: 4

prompt%

Note: the command line comes from this SO answer.

share|improve this answer

edited yesterday

answered yesterday

FólkvangrFólkvangr

37022 silver badges1414 bronze badges

add a comment | 

0

jq can accept text input as well, but by default, jq reads a stream of JSON entities [...] from stdin.

Therefore, you can type the input interactively using the keyboard. Use Ctrl+d to terminate the input (see also this explanation on SO). The main drawback is that you cannot use the usual keys e.g. ←, ↑, Ctrl+a.

prompt% jq -r '.[] | [ .string, .number|tostring ] | join(": ")' -

[{ "number": 9, "string": "nine"},

 { "number": 4, "string": "four"}]

nine: 9

four: 4

prompt%

Note: the command line comes from this SO answer.

share|improve this answer

edited yesterday

answered yesterday

FólkvangrFólkvangr

37022 silver badges1414 bronze badges

add a comment | 

jq can accept text input as well, but by default, jq reads a stream of JSON entities [...] from stdin.

Therefore, you can type the input interactively using the keyboard. Use Ctrl+d to terminate the input (see also this explanation on SO). The main drawback is that you cannot use the usual keys e.g. ←, ↑, Ctrl+a.

prompt% jq -r '.[] | [ .string, .number|tostring ] | join(": ")' -

[{ "number": 9, "string": "nine"},

 { "number": 4, "string": "four"}]

nine: 9

four: 4

prompt%

Note: the command line comes from this SO answer.

share|improve this answer

edited yesterday

answered yesterday

FólkvangrFólkvangr

37022 silver badges1414 bronze badges

prompt% jq -r '.[] | [ .string, .number|tostring ] | join(": ")' -

[{ "number": 9, "string": "nine"},

 { "number": 4, "string": "four"}]

nine: 9

four: 4

prompt%

share|improve this answer

edited yesterday

answered yesterday

FólkvangrFólkvangr

37022 silver badges1414 bronze badges

answered yesterday

FólkvangrFólkvangr

37022 silver badges1414 bronze badges

answered yesterday

FólkvangrFólkvangr

37022 silver badges1414 bronze badges