Shell Programming and Scripting

# sed -i '/^INTERFACE_NAME\[8\]="lan5:5"$,/^INTERFACE_MODULES\[8\]=""$/d' file
sed: -e expression #1, char 34: unknown command: `^'

#!/bin/ksh
# Usage: tester file pattern
# For the example given in this thread, file is the name of the input file and
# pattern is lan5:5.
if [ $# -ne 2 ] || ! cp $1 backup$$
then    printf "Usage: %s file pattern\n" ${0##*/} >&2
        exit 1
fi
# Gather operands:
file="$1"
pattern="$2"
printf "A backup copy of \"%s\" has been saved as \"%s\"\n" "$file" backup$$

# Try 1st example using sed to create a pattern to match and ex to remove lines
# containing that pattern.
echo 'using sed and ex:'
# Set RE to a BRE that will match "[digits]" where digits is the value found on
# the line that contains the given pattern inside double quotes, and print that
# BRE for reference..
RE="$(sed -n "s/.*[[]\\([0-9]*\\)[]].*\"$pattern\".*/[[]\\1[]]/p" "$file")"
printf "RE is \"%s\"\n" "$RE"

# Use ex to delete every line from file that matches the computed RE and check
# the exit status:
if ex -s "$file" <<-EOF
        :g/$RE/d
        :wq
EOF
then    # ex complted successfully, verify that we got the expected results:
        if diff "$file" expected
        then    echo 'Succeeded'
        fi
else    echo 'ex or sed error or no match found'
fi

# Print the updated file:
cat "$file"

# Now try 2nd example using awk:
echo
echo 'using awk:'

# Restore the given file to its original contents
cp backup$$ "$file"

if awk -v pat="\"$pattern\"" '
$0 ~ pat {
        # We found a line that contains the given pattern inside double quotes.
        if(match($0, /[[][0-9]+[]]/)) {
                # And we found a digit string between "[" an "]", create a
                # pattern to match that digit string and the "[" before it and
                # the "]" after it
                RE = "[[]" substr($0, RSTART + 1, RLENGTH - 2) "[]]"
                # Note that we have found the pattern and created an ERE to
                # match the correponding digit string in square brackets:
                found = 1       # Note that we have found the pattern and
                                # created an ERE to match the digit string.
        }
}
!found || $0 !~ RE      # print the current line if we have not found the
                        # pattern or have found the pattern but this line does
                        # not match the ERE.
END {   exit !found     # Set exit status: 0->success, 1->pattern not found
}' "$file" > _tmp$$
then    # awk completed successfully, cp results back to the input file and
        # remove the temp file:
        cp _tmp$$ "$file"
        rm _tmp$$
else    echo "awk failed or no match found"
fi
# Verify that we got what we expected:
if diff "$file" expected
then    # Success, print the updated file.
        echo 'Succeeded'
        cat "$file"
fi
if [ -f _tmp$$ ]
then    # awk failed, print the contents of our temp file:
        echo _tmp$$
        cat "_tmp$$"
fi

chmod +x tester

./tester file "lan5:5"

A backup copy of "file" has been saved as "backup94188"
using sed and ex:
RE is "[[]8[]]"
Succeeded
BROADCAST_ADDRESS[5]="10.140.236.255"
INTERFACE_STATE[5]="up"
DHCP_ENABLE[5]="0"
INTERFACE_MODULES[5]=""
ROUTE_DESTINATION[2]=default
ROUTE_GATEWAY[2]=10.40.118.4
ROUTE_COUNT[2]=1
INTERFACE_NAME[10]="lan5:7"
IP_ADDRESS[10]="10.140.239.62"
SUBNET_MASK[10]="255.255.255.0"
BROADCAST_ADDRESS[10]="10.140.239.255"
INTERFACE_STATE[10]="up"
DHCP_ENABLE[10]="0"

using awk:
Succeeded
BROADCAST_ADDRESS[5]="10.140.236.255"
INTERFACE_STATE[5]="up"
DHCP_ENABLE[5]="0"
INTERFACE_MODULES[5]=""
ROUTE_DESTINATION[2]=default
ROUTE_GATEWAY[2]=10.40.118.4
ROUTE_COUNT[2]=1
INTERFACE_NAME[10]="lan5:7"
IP_ADDRESS[10]="10.140.239.62"
SUBNET_MASK[10]="255.255.255.0"
BROADCAST_ADDRESS[10]="10.140.239.255"
INTERFACE_STATE[10]="up"
DHCP_ENABLE[10]="0"

./tester file "lan5:x"

for dix in $(
 sed -n 's/^INTERFACE_NAME\[\([0-9]\{1,9\}\)\]="lan5:5"$/\1/p' yourfile
 )
do
 sed -i '/\['"$idx"'\]/d' yourfile
done