07-01-2011
read takes one line, unless you muck with env I suppose, and puts the first field in the first variable and so on with the rest in the last variable. Apparently the version is the 3rd field of the first line. The cat is lazy, read <file is cheaper than a fork, pipe, exec of cat.
<< is a converter of script lines to stdin, and stops on a line with the following token only. The script lines are expanded for variables and such, so I prefer echo '...'|, where single quotes keep things literal. << copies the processed lines to a temp file, so it is the cost of a temp file create versus a pipe, echo being a builtin.
Last edited by DGPickett; 07-01-2011 at 11:59 AM..
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LEARN ABOUT OPENDARWIN
env
ENV(1) BSD General Commands Manual ENV(1)
NAME
env -- set and print environment
SYNOPSIS
env [-i] [name=value ...] [utility [argument ...]]
DESCRIPTION
env executes utility after modifying the environment as specified on the command line. The option name=value specifies an environmental
variable, name, with a value of value. The option '-i' causes env to completely ignore the environment it inherits.
If no utility is specified, env prints out the names and values of the variables in the environment, with one name=value pair per line.
DIAGNOSTICS
If the utility is invoked, the exit status of env shall be the exit status of utility; otherwise, the env utility exits with one of the fol-
lowing values:
0 The env utility completed successfully
1-125 An error occurred in the env utility.
126 The utility specified by utility was found, but could not be invoked.
127 The utility specified by utility could not be found.
COMPATIBILITY
The historic - option has been deprecated but is still supported in this implementation.
SEE ALSO
execvp(3), environ(7)
STANDARDS
The env utility conforms to IEEE Std 1003.2-1992 (``POSIX.2'').
BUGS
env doesn't handle commands with equal (``='') signs in their names, for obvious reasons.
BSD
August 27, 1993 BSD