Checking package installation in FreeBSD via sh?

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for_stupid_answer2015-06-17 17:54:14

linux

for_stupid_answer, 2015-06-17 17:54:14

FreeBSD 10.1
Need to script .sh with conditions.
If the pcre package (as an example) is not installed, then run the command: pkg install pcre
Otherwise, skip.
Which command can be used to check if a package is installed?
Currently checking: pkg info | grep pcre
Is it true? And how are the conditions in .sh files correctly compiled?
UPD:
I would also like to know what command you can find out the user's login, because. if the user is not root, add sudo to the command.

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2 answer(s)

A

athacker, 2015-06-17
@for_stupid_answer

Yes, you can check this. Just keep in mind that the combination of characters 'pcre' can be found in a number of packages :-)
How conditions are made -- man test. For syntax examples, you can refer to any of the scripts that are in /etc/rc.d/
User login can be found from environment variables. The setenv command with no options, or printenv is a USER variable.

M

MgmZog, 2015-06-17
@MgmZog

For user login, there is a "whoami" command, for example, which actually answers the question who am I?