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shbash脚本(代码片段)

author  author  2022-12-20  784

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# [] source bash_var.sh

check_var () 
    varname=$1
    varvalue=$!1
    echo "# check_var function #"
    echo "varname="$varname
    echo "varvalue="$varvalue

    if [ -z $varvalue ]; then
        echo $varname "not set and will be set to value" \'$2\'
        declare -g $varname=$2
        # must give '-g' or the variable will be local
        # identical         # declare -g $1=$2
        # eval is dangerous # eval $1='$2'
    else
        echo $varname "is set to value" \'$varvalue\'
    fi
    echo


unset TEST_VAR1
unset TEST_VAR2
unset TEST_VAR3

TEST_VAR1="test1"
TEST_VAR2="     "

set | grep TEST_VAR1
set | grep TEST_VAR2
set | grep TEST_VAR3
echo

check_var TEST_VAR1 already
check_var TEST_VAR2 test2
check_var TEST_VAR3 test3

set | grep TEST_VAR1
set | grep TEST_VAR2
set | grep TEST_VAR3

# before ! first ! run this script
# [] set > set_default
# run script
# [] source bash_set.sh

test_function() 
    echo "test function"
    TEST_VARF="testf"

TEST_VAR1="test1"
TEST_VAR2="test2"

set | grep TEST_VAR1
set | grep TEST_VAR2
set | grep test_function
set | grep TEST_VARF
echo

unset TEST_VAR2
unset test_function

set | grep TEST_VAR1
set | grep TEST_VAR2
set | grep test_function
set | grep TEST_VARF
echo

unset COMPREPLY
_kernel_versions
echo $COMPREPLY
# array without an index only gives the first element

unset 'COMPREPLY[0]'
_ip_addresses
echo $COMPREPLY[0]

if [ -z "$TEST_VAR1" ]; then
    echo "TEST_VAR1 not set"
else
    echo "TEST_VAR1 is set"
fi

if [ -z "$TEST_VAR2" ]; then
    echo "TEST_VAR2 not set"
else
    echo "TEST_VAR2 is set"
fi

echo
unset TEST_VAR2
# TEST_VAR2 will set to the value "" only if it is unset
: $TEST_VAR2=""
set | grep TEST_VAR2
: $TEST_VAR2="empty string"
set | grep TEST_VAR2
# TEST_VAR2 set to "" if TEST_VAR2 is unset or the empty string
: $TEST_VAR2:="test2"
set | grep TEST_VAR2
: $TEST_VAR2:="already exists"
set | grep TEST_VAR2

echo; echo "### diff ###"
set > set_after
diff set_default set_after

# [] source bash_mucha.sh
#
# see in /etc/profile function "pathmunge"

check_var () 
    varname=$1
    varvalue=$!1
    echo "# check_var function #"
    echo "varname="$varname
    echo "varvalue="$varvalue

    if [ -z $varvalue ]; then
        echo $varname "not set and will be set to value" \'$2\'
        declare -g $varname=$2
    elif [[ $!1 != *$2* ]]; then
        echo $varname "value" \'$varvalue\' "without" \'$2\'
        echo "TERBA DODAT"
        declare -g $varname=$varvalue"-AND-"$2
    else
        echo $varname "value" \'$varvalue\' "already contain" \'$2\'
        echo "UZ OBSAHUJE"
    fi
    echo


unset TEST_VAR1
unset TEST_VAR2
unset TEST_VAR3

TEST_VAR1="test1"
TEST_VAR2="test2"

set | grep TEST_VAR1
set | grep TEST_VAR2
set | grep TEST_VAR3
echo

check_var TEST_VAR1 test1
check_var TEST_VAR2 more2
check_var TEST_VAR3 test3

set | grep TEST_VAR1
set | grep TEST_VAR2
set | grep TEST_VAR3

echo;echo;echo

check_var TEST_VAR1 most1
check_var TEST_VAR2 most2
check_var TEST_VAR3 test3

set | grep TEST_VAR1
set | grep TEST_VAR2
set | grep TEST_VAR3

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