initial commit

README.md

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+# fx' linux scripts
+This repo contains different little bash scripts created during the LPIC course in april/may 2024

to_ip4.sh

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+#!/bin/bash
+
+# Step 0: Make sure we have an argument
+if [ -z "$1" ]; then
+  echo "Usage: $0 <input_string> (input string being last two blocks of ip6, e.g. fe36:d00f)"
+  exit 1
+fi
+
+input=$1
+
+# Step 1: Split the input string at ":"
+IFS=':' read -r part1 part2 <<< "$input"
+
+# Step 2: Pad each of the two fields to 4 characters by adding leading zeros
+part1=$(printf '%04x' 0x$part1)
+part2=$(printf '%04x' 0x$part2)
+
+# Step 3: Split each of the four-digit numbers into two digit numbers
+# e.g., 4f33 becomes 4f and 33
+part1a=${part1:0:2}
+part1b=${part1:2:2}
+part2a=${part2:0:2}
+part2b=${part2:2:2}
+
+# Step 4: Translate each hexadecimal two-digit number into decimal
+decimal1a=$(printf '%d' 0x$part1a)
+decimal1b=$(printf '%d' 0x$part1b)
+decimal2a=$(printf '%d' 0x$part2a)
+decimal2b=$(printf '%d' 0x$part2b)
+
+# Step 5: Concat all numbers with a point '.'
+result="$decimal1a.$decimal1b.$decimal2a.$decimal2b"
+
+# Output the result
+echo "$result"
+

var_comparison.sh

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+#!/bin/bash
+same=0
+sSet=$(set | grep -E "^\w+=")
+sEnv=$(env | grep -E "^\w+=")
+
+echo "set: $(wc -l <<<$sSet) variablen"
+echo "env: $(wc -l <<<$sEnv) variablen"
+
+for v in $sEnv; do
+  if echo "$sSet" | grep -q "$v"; then
+    ((same++))
+  fi
+done
+echo "$same variables in both set and env"