gcloud storage cat

NAME: gcloud storage cat - outputs the contents of one or more URLs to stdout
SYNOPSIS: gcloud storage cat URL [URL …] [--additional-headers=HEADER=VALUE] [--display-url, -d] [--range=RANGE, -r RANGE] [--decryption-keys=[DECRYPTION_KEY,…]] [GCLOUD_WIDE_FLAG …]
DESCRIPTION: The cat command outputs the contents of one or more URLs to stdout. While the cat command does not compute a checksum, it is otherwise equivalent to doing:
gcloud storage cp url… -

(The final '-' causes gcloud to stream the output to stdout.)
EXAMPLES: The following command writes all text files in a bucket to stdout:
gcloud storage cat gs://bucket/*.txt

The following command outputs a short header describing file.txt, along with its contents:
gcloud storage cat -d gs://my-bucket/file.txt

The following command outputs bytes 256-939 of file.txt:
gcloud storage cat -r 256-939 gs://my-bucket/file.txt

The following command outputs the last 5 bytes of file.txt:
gcloud storage cat -r -5 gs://my-bucket/file.txt
POSITIONAL ARGUMENTS: URL [URL …]

The url of objects to list.
FLAGS: --additional-headers=HEADER=VALUE

Includes arbitrary headers in storage API calls. Accepts a comma separated list of key=value pairs, e.g. header1=value1,header2=value2. Overrides the default storage/additional_headers property value for this command invocation.

--display-url, -d

Prints the header before each object.

--range=RANGE, -r RANGE

Causes gcloud storage to output just the specified byte range of the object. In a case where "start" = 'x', and "end" = 'y', ranges take the form: x-y (e.g., -r 256-5939), x- (e.g., -r 256-), -y (e.g., -r -5)
When offsets start at 0, x-y means to return bytes x through y (inclusive), x- means to return bytes x through the end of the object, and -y changes the role of y. If -y is present, then it returns the last y bytes of the object.
If the bytes are out of range of the object, then nothing is printed
ENCRYPTION FLAGS: --decryption-keys=[DECRYPTION_KEY,…]

A comma-separated list of customer-supplied encryption keys (RFC 4648 section 4 base64-encoded AES256 strings) that will be used to decrypt Cloud Storage objects. Data encrypted with a customer-managed encryption key (CMEK) is decrypted automatically, so CMEKs do not need to be listed here.
GCLOUD WIDE FLAGS: These flags are available to all commands: --access-token-file, --account, --billing-project, --configuration, --flags-file, --flatten, --format, --help, --impersonate-service-account, --log-http, --project, --quiet, --trace-token, --user-output-enabled, --verbosity.
Run $ gcloud help for details.
NOTES: This variant is also available:
gcloud alpha storage cat