diff options
Diffstat (limited to 'jq.html.markdown')
| -rw-r--r-- | jq.html.markdown | 48 |
1 files changed, 27 insertions, 21 deletions
diff --git a/jq.html.markdown b/jq.html.markdown index 31ce4d43..2178820f 100644 --- a/jq.html.markdown +++ b/jq.html.markdown @@ -132,8 +132,9 @@ jq --arg text "$(date; echo "Have a nice day!")" -n '{ "today": $text }' # } -# Instead of outputting values as JSON, you can use the `-r` option to print string -# values unquoted / unescaped. Non-string values are still printed as JSON. +# Instead of outputting values as JSON, you can use the `-r` option to print +# string values unquoted / unescaped. Non-string values are still printed as +# JSON. # echo '"hello" 2 [1, "two", null] {}' | jq -r . @@ -157,13 +158,14 @@ jq -rn '"1 + 2 = \(1+2)"' # 1 + 2 = 3 -# The `-r` option is most useful for generating text outputs to be processed down -# in a shell pipeline, especially when combined with an intepolated string that is -# prefixed the `@sh` prefix operator. +# The `-r` option is most useful for generating text outputs to be processed +# down in a shell pipeline, especially when combined with an intepolated +# string that is prefixed the `@sh` prefix operator. # -# The `@sh` operator escapes the outputs of `\(...)` inside a string with single -# quotes so that each resulting string of `\(...)` can be evaluated by the shell -# as a single word / token / argument without special interpretations. +# The `@sh` operator escapes the outputs of `\(...)` inside a string with +# single quotes so that each resulting string of `\(...)` can be evaluated +# by the shell as a single word / token / argument without special +# interpretations. # env_vars=$( echo '{"var1": "value one", "var2": "value\ntwo"}' \ @@ -187,11 +189,12 @@ declare -p var1 var2 # declare -- var2="value # two" -# There are other string `@prefix` operators (e.g., @base64, @uri, @csv, ...) that might -# be useful to you. See `man jq` for details. +# There are other string `@prefix` operators (e.g., @base64, @uri, @csv, ...) +# that might be useful to you. See `man jq` for details. -# The comma (`,`) operator in jq evaluates each operand and generates multiple outputs: +# The comma (`,`) operator in jq evaluates each operand and generates multiple +# outputs: # jq -n '"one", 2, ["three"], {"four": 4}' @@ -206,7 +209,9 @@ jq -n '"one", 2, ["three"], {"four": 4}' # } -# Any JSON value is a valid jq expression that evaluates to the JSON value itself. +# Any JSON value is a valid jq expression that evaluates to the JSON value +# itself. +# jq -n '1, "one", [1, 2], {"one": 1}, null, true, false' # Output: @@ -224,8 +229,8 @@ jq -n '1, "one", [1, 2], {"one": 1}, null, true, false' # false -# Any jq expression can be used where a JSON value is expected, even as object keys. -# (though parenthesis might be required for object keys or values) +# Any jq expression can be used where a JSON value is expected, even as object +# keys. (though parenthesis might be required for object keys or values) # jq -n '[2*3, 8-1, 16/2], {("tw" + "o"): (1 + 1)}' @@ -259,8 +264,8 @@ jq -n '{ c: 3} | { a: 1, "b", c }' # jq programs are more commonly written as a series of expressions (filters) -# connected by the pipe (`|`) operator, which makes the output of its left filter -# the input to its right filter. +# connected by the pipe (`|`) operator, which makes the output of its left +# filter the input to its right filter. # jq -n '1 | . + 2 | . + 3' # first dot is 1; second dot is 3 @@ -292,8 +297,8 @@ jq -n '1, 2, 3 | ., 4 | .' # 1, 2, 3 | 3, *4 | *4 # # -# To put it another way, the evaluation of the above example is very similar to the -# following pieces of code in other programming languages: +# To put it another way, the evaluation of the above example is very similar +# to the following pieces of code in other programming languages: # # In Python: # @@ -376,8 +381,8 @@ jq -n '"abc" | .name? // "unknown"' # => "unknown" # the current iteration of the loop in some programming languages. -# Strings and arrays can be sliced with the same syntax (`[i:j]`, but no steppings) -# and semantic as found in the Python programming language: +# Strings and arrays can be sliced with the same syntax (`[i:j]`, but no +# steppings) and semantic as found in the Python programming language: # # 0 1 2 3 4 5 ... infinite # array = ["a", "b", "c", "d"] @@ -596,7 +601,8 @@ echo $numbers | jq -rs ' # Slurp the numbers into an array. ] # Finally, contain all groups in an array. | sort_by([length, max]) # Sort the groups by their sizes. - # If two groups have the same size then the one with the largest number wins (is bigger). + # If two groups have the same size then the one with the largest + # number wins (is bigger). | to_entries[] # Enumerate the array, generating key-value objects. | # For each object, generate two lines: |