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Full Discussion: Replace environment variables with sed
Top Forums Shell Programming and Scripting Replace environment variables with sed Post 302217750 by alex_5161 on Wednesday 23rd of July 2008 12:47:04 PM
Old 07-23-2008
If I understand you right, you are going to add some filter into the print-env-var-script?!
If so, (assuming the environment printed out with variable names) you coud 'sed' for any line with substring 'PASS=' and replase following with '*****':
Code:
> env | sed  's/^\(.*PASS=\).*/\1*****/'

- so, it's remembering as \1 a beggining of a string with 'PASS=' and replace that string with the remembered \1 part and '*****'
The same pipe you can add in command of executing the script; so it will filtering the script's output.

If you do not have the variable's names (seems unbelievable), you can get all *PASS variables into a file or local variables and filtering printout in the way you already have, using retrieved values.

. (By the way, having a variables in sed-command part it is better to use:
... sed "commands" file
. ( - IMHO) )

For local variable: (I've used '*NAME' variables)
Code:
> for ln in $(env|grep -i name); do 
>>  sed_cmd=$sed_cmd"s/${ln#*=}/*****/g; "; 
>>done
>echo $sed_cmd
s/dstnsun0/*****/g;
s/geo_usa/*****/g;
s/dca0701/*****/g;
> env|sed "$sed_cmd" | grep -i name
MAPMARKER_RPC_HOSTNAME=*****
MAPMARKER_DBNAME=*****
LOGNAME=*****

For file:
Code:
>rm sed_cmd.t
> for ln in $(env|grep -i name); do ec "s/${ln#*=}/*****/g;">>sed_cmd.t; done
> env|sed -f sed_cmd.t | grep -i name

 

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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
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