11-21-2018
Answer the qs in UNIX commands
1) whats the output of the below script, when executed at the command line
vi test.ksh
echo 'output $@:'$@
echo 'output$#:'$#
----------------
cmd execution as follows
$test.ksh Hello"
a)output $@:1,output $#:Hello
b)output $@:Hello,output $#:1
c)output$@:,output $#:
d)None of the above
2)whats the output of following script
pdate='20090130
pcomp='ABC
echo '$pdate'"_$pdate"
a)ABC+20090130
b) $pcomp_20090130
c)ABC_$pdate
d)ABC_pdate
3) whats the output for the following environment variable
echo "SHELL1"$SHELL"
SHELL='Hello'
echo "SHELL2:$SHELL"
a)SHELL1:,SHELL2:
b)SHELL1:ksh,SHELL2:Hello
c)SHELL1: <default shell>,SHELL2:Hello
d) SHELL1:SHELL,SHELL2:SHELL
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LEARN ABOUT X11R4
envsubst
ENVSUBST(1) GNU ENVSUBST(1)
NAME
envsubst - substitutes environment variables in shell format strings
SYNOPSIS
envsubst [OPTION] [SHELL-FORMAT]
DESCRIPTION
Substitutes the values of environment variables.
Operation mode:
-v, --variables
output the variables occurring in SHELL-FORMAT
Informative output:
-h, --help
display this help and exit
-V, --version
output version information and exit
In normal operation mode, standard input is copied to standard output, with references to environment variables of the form $VARIABLE or
${VARIABLE} being replaced with the corresponding values. If a SHELL-FORMAT is given, only those environment variables that are referenced
in SHELL-FORMAT are substituted; otherwise all environment variables references occurring in standard input are substituted.
When --variables is used, standard input is ignored, and the output consists of the environment variables that are referenced in SHELL-FOR-
MAT, one per line.
AUTHOR
Written by Bruno Haible.
REPORTING BUGS
Report bugs to <bug-gnu-gettext@gnu.org>.
COPYRIGHT
Copyright (C) 2003-2007 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
The full documentation for envsubst is maintained as a Texinfo manual. If the info and envsubst programs are properly installed at your
site, the command
info envsubst
should give you access to the complete manual.
GNU gettext-runtime 0.17 November 2007 ENVSUBST(1)