|
CS469/569 - Linux and Unix Administration and NetworkingSpring 2022 |
Bash Script Examples
n x n box:
```
function box() {
declare -i n=$1 r c;
for ((r=0; r
n row high pyramid:
```
function pyramid() {
declare -i n=$1 r c s a;
let s=n-1;
let a=1;
for((r=0; r
params.sh
```
#!/bin/bash
declare -i pp=1;
for p; do
echo "$pp: $p";
let pp++;
done
```
- Use:
chmod a+rx params.shto make executable.
sizes.sh
```
#!/bin/bash
let total=0;
# Always quote variables that may contain a filename as filenames may contain
# spaces.
# Iterates over the positional parameters, placing their values in f one at a
# time:
for f; do
let size=$(stat -c%s "$f");
printf "%12d %s\n" $size "$f";
let total+=size;
done
printf "Total = %d\n" $total;
```
draw.sh
```
#!/bin/bash
read rows cols < <(stty size);
let row=rows/2;
let col=cols/2;
let pen=0;
tput clear;
while true
do
tput cup $row $col;
if (( pen )); then
echo -n -e "#\b";
else
echo -n -e " \b";
fi
read -n 1 -s key;
case $key in
[wW]) if (( row )); then let row--; fi ;;
[sS]) if (( row < rows-1 )); then let row++; fi ;;
[aA]) if (( col )); then let col--; fi ;;
[dD]) if (( col < cols-1 )); then let col++; fi ;;
[qQ]) break ;;
*) let pen^=1 ;;
esac
done
```