consistently use --help in usage text

src/cmd/behead.rs

@@ -3,6 +3,7 @@ Drop a CSV file's header.
 
 Usage:
  qsv behead [options] [<input>]
+ qsv behead --help
 
 Common options:
  -h, --help Display this message

src/cmd/count.rs

@@ -6,6 +6,7 @@ given).
 
 Usage:
  qsv count [options] [<input>]
+ qsv count --help
 
 count options:
  -H, --human-readable Comma separate row count.

src/cmd/dedup.rs

@@ -14,6 +14,7 @@ A duplicate count will also be sent to <stderr>.
 
 Usage:
  qsv dedup [options] [<input>]
+ qsv dedup --help
 
 sort options:
  -s, --select <arg> Select a subset of columns to dedup.

src/cmd/excel.rs

@@ -16,6 +16,7 @@ not all columns with numeric values.
 
 Usage:
  qsv excel [options] [<input>]
+ qsv excel --help
 
 Excel options:
  -s, --sheet <name/index> Name or zero-based index of sheet to export.

src/cmd/fetch.rs

@@ -95,6 +95,7 @@ $ qsv fetch URL data.csv --http-header "X-Api-Key:TEST_KEY" --http-header "X-Api
 
 Usage:
  qsv fetch [<url-column> | --url-template <template>] [--jql <selector> | --jqlfile <file>] [--http-header <k:v>...] [options] [<input>]
+ qsv fetch --help
 
 Fetch options:
  <url-column> URL column to use.

src/cmd/fetchpost.rs

@@ -68,6 +68,7 @@ $ qsv fetchpost https://httpbin.org/post col1-col3 data.csv --http-header "X-Api
 
 Usage:
  qsv fetchpost <url-column> <column-list> [--jql <selector> | --jqlfile <file>] [--http-header <k:v>...] [options] [<input>]
+ qsv fetchpost --help
 
 Fetch options:
  <url-column> If the argument starts with `http`, the URL to use.

src/cmd/fixlengths.rs

@@ -12,6 +12,7 @@ This requires a single pass and can be done with stdin.
 
 Usage:
  qsv fixlengths [options] [<input>]
+ qsv fixlengths --help
 
 fixlengths options:
  -l, --length <arg> Forcefully set the length of each record. If a

src/cmd/flatten.rs

@@ -9,6 +9,7 @@ contents of each field to provide a summary view.
 
 Usage:
  qsv flatten [options] [<input>]
+ qsv flatten --help
 
 flatten options:
  -c, --condense <arg> Limits the length of each field to the value

src/cmd/fmt.rs

@@ -9,6 +9,7 @@ useful.
 
 Usage:
  qsv fmt [options] [<input>]
+ qsv fmt --help
 
 fmt options:
  -t, --out-delimiter <arg> The field delimiter for writing CSV data.

src/cmd/frequency.rs

@@ -14,6 +14,7 @@ cardinality of each column is required.
 
 Usage:
  qsv frequency [options] [<input>]
+ qsv frequency --help
 
 frequency options:
  -s, --select <arg> Select a subset of columns to compute frequencies

src/cmd/generate.rs

@@ -32,6 +32,7 @@ Usage:
  qsv generate [options] [--rows=<count>] <input>
  qsv generate [options] [--rows=<count>] (--indsp=<file>)
  qsv generate [options] (--outdsp=<file>) [<input>]
+ qsv generate --help
 
 generate options:
  -r, --rows=<count> Number of rows of test data to generate.

src/cmd/headers.rs

@@ -9,6 +9,7 @@ the --intersect flag.
 
 Usage:
  qsv headers [options] [<input>...]
+ qsv headers --help
 
 headers options:
  -j, --just-names Only show the header names (hide column index).

src/cmd/input.rs

@@ -17,6 +17,7 @@ for further processing with other qsv commands.
 
 Usage:
  qsv input [options] [<input>]
+ qsv input --help
 
 input options:
  --quote <arg> The quote character to use. [default: "]

src/cmd/reverse.rs

@@ -8,6 +8,7 @@ Note that this requires reading all of the CSV data into memory.
 
 Usage:
  qsv reverse [options] [<input>]
+ qsv reverse --help
 
 Common options:
  -h, --help Display this message

src/cmd/schema.rs

@@ -16,6 +16,7 @@ Note that `stdin.csv` will be overwritten if it already exists.
 
 Usage:
  qsv schema [options] [<input>]
+ qsv schema --help
 
 Schema options:
  --enum-threshold NUM Cardinality threshold for adding enum

src/cmd/slice.rs

@@ -15,6 +15,7 @@ parsed.
 
 Usage:
  qsv slice [options] [<input>]
+ qsv slice --help
 
 slice options:
  -s, --start <arg> The index of the record to slice from.

src/cmd/sniff.rs

@@ -10,7 +10,8 @@ If you want more robust, guaranteed schemata, use the "schema" or "stats" comman
 instead as they scan the entire file.
 
 Usage:
- qsv sniff [options] [<input>] 
+ qsv sniff [options] [<input>]
+ qsv sniff --help
 
 sniff options:
  --sample <size> First n rows to sample to sniff out the metadata.

src/cmd/sort.rs

@@ -7,6 +7,7 @@ extsort command instead.
 
 Usage:
  qsv sort [options] [<input>]
+ qsv sort --help
 
 sort options:
  -s, --select <arg> Select a subset of columns to sort.

src/cmd/sortcheck.rs

@@ -22,6 +22,7 @@ Returns exit code 0 if a CSV is sorted, and exit code 1 otherwise.
 
 Usage:
  qsv sortcheck [options] [<input>]
+ qsv sortcheck --help
 
 sort options:
  -s, --select <arg> Select a subset of columns to check for sort.

src/cmd/stats.rs

@@ -28,6 +28,7 @@ first with 'qsv index' to enable multithreading.
 
 Usage:
  qsv stats [options] [<input>]
+ qsv stats --help
 
 stats options:
  -s, --select <arg> Select a subset of columns to compute stats for.

src/cmd/table.rs

@@ -9,6 +9,7 @@ CSV data before formatting it with this command.
 
 Usage:
  qsv table [options] [<input>]
+ qsv table --help
 
 table options:
  -w, --width <arg> The minimum width of each column.

src/cmd/transpose.rs

@@ -6,6 +6,7 @@ unless --multipass is given.
 
 Usage:
  qsv transpose [options] [<input>]
+ qsv transpose --help
 
 transpose options:
  -m, --multipass Process the transpose by making multiple

src/cmd/validate.rs

@@ -12,6 +12,7 @@ JSON Schema can be a local file or a URL.
 
 Usage:
  qsv validate [options] [<input>] [<json-schema>]
+ qsv validate --help
 
 Validate options:
  --fail-fast Stops on first error.