10-28-2010
Appending from a file to a script and vice versa
Hi,
I am new to Unix and discovered this example problem online that I believe will help my learning:
Run the command's below
env >> xx
env >> xx
env >> xx
env >> xx
env >> xx
You will now have a file called XX with the env redirected into it 5 times
Create a script named 'username' that takes 1 argument being a file, in this instance we will use the newly created file above xx. Read the input file and look for occurrences of the current user who is executing the script. On finding an occurrence of the username take that line and append it to a file and display a line number and a bracket against the saved line.
Any ideas of how best to tackle this problem?
All replies will be much appreciated
Jimmy Champion
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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