3 files changed, 44 insertions, 0 deletions
diff --git a/3 Resources/Bash/Expansion.md b/3 Resources/Bash/Expansion.md
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+++ b/3 Resources/Bash/Expansion.md
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+---
+tags:
+  - bash
+---
+Find about in the manual `man bash` (search EXPANSION). This document will hold some often used expansions.
+
+**Variable expansion**
+substr
+`${VAR:offset:len}`
+\ No newline at end of file
diff --git a/3 Resources/Bash/Generate random integers.md b/3 Resources/Bash/Generate random integers.md
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+---
+tags:
+  - bash
+---
+The environment variable `RANDOM` contains an int between 0-32768.
+
+```
+min=10
+max=20 
+echo $(($RANDOM%($max-$min+1)+$min))
+20
+echo $(($RANDOM%($max-$min+1)+$min))
+14
+```
+
+Using parameter [[Expansion]] we can just grab the first number:
+```
+${RANDOM:0}
+```
+\ No newline at end of file
diff --git a/3 Resources/Bash/Heredoc.md b/3 Resources/Bash/Heredoc.md
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+```
+read -r -d '' VAR <<EOF
+blaat
+EOF
+```
+
+```
+var=$(
+cat <<EOF
+blaat
+EOF
+)
+```
+
+Quote EOF/NAME to prevent expansion
+Put  - after << to remove indentation from result
+\ No newline at end of file