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Michael Martinez
Asked: 2016-04-19 16:15:23 +0800 CST

unix utility to limit the number of bytes placed into a bash variable

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Is there a unix/linux utility, perhaps a shell builtin or an external command, that will limit the number of bytes placed into a bash variable? For example, I want to make sure STRING gets at most 1000 bytes (or some arbitrary number I choose) from the output of the curl (or other) command:

STRING=$(curl -s http://localhost:8010/status?)

Let me edit this to make clear that I'm just using curl as an example, but I'd like this to work with any command.

bash

1 Answers

  1. Just add -r 0-1000 to your curl commandline, i.e.:

    STRING=$(curl -r 0-1000 -s http://localhost:8010/status?)

    Or generically you can use head -c 1000, i.e.:

    STRING=$(curl -s http://localhost:8010/status? | head -c 1000)
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