upd

labs/lab2/scripts/q.sh

@@ -0,0 +1,3 @@
+count=10
+echo $(( count-- ))
+echo $(( count-- ))

labs/lab2/scripts/script221.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+[ "$#" -ne 2 ] && echo "usage: $0 str1 str2" && exit 1
+[ "$1" = "$2" ] && echo "equal" || echo "not equal"

labs/lab2/scripts/script222.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+[ "$#" -ne 3 ] && echo "usage: $0 a b c" && exit 1
+a=$1
+b=$2
+c=$3
+max=$a
+(( b > max )) && max=$b
+(( c > max )) && max=$c
+echo "$max"

labs/lab2/scripts/script223.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+arr=()
+while IFS= read -r line; do
+  [ "$line" = "q" ] && break
+  arr+=("$line")
+done
+printf "%s" "${arr[*]} "
+

labs/lab2/scripts/script224.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+count=0
+while IFS= read -r n; do
+  r=$(( n % 2 ))
+  [ "$r" -eq 0 ] && break
+  count=$(( count + 1 ))
+done
+echo "$count"
+

labs/lab2/scripts/script225.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+for cmd in nano vi links; do
+  command -v "$cmd" >/dev/null 2>&1 || { echo "$cmd is not installed"; exit 1; }
+done
+echo "1) nano"
+echo "2) vi"
+echo "3) links"
+echo "4) exit"
+read -r -p "choose 1-4: " choice
+case "$choice" in
+  1) exec nano ;;
+  2) exec vi ;;
+  3) exec links ;;
+  4) exit 0 ;;
+  *) echo "invalid choice" ; exit 1 ;;
+esac
+

labs/lab2/scripts/script226.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+[ "$#" -ne 3 ] && echo "usage: $0 file h|t N" && exit 1
+file=$1
+mode=$2
+num=$3
+case "$mode" in
+  h) head -n "$num" -- "$file" 2>/dev/null ;;
+  t) tail -n "$num" -- "$file" 2>/dev/null ;;
+  *) echo "mode must be h or t" ; exit 1 ;;
+esac
+

labs/lab2/scripts/script23.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+n=${1:-1000000}
+command -v bc >/dev/null 2>&1 || { echo "bc is required"; exit 1; }
+
+bench() {
+  printf 'scale=10\na=1.2345678901\nb=1.2345678901\nfor(i=0;i<%s;i++) x=a*b\n' "$n" | bc >/dev/null
+}
+
+start=$(date +%s.%N)
+bench
+end=$(date +%s.%N)
+
+dur=$(echo "$end - $start" | bc -l)
+flops=$(echo "$n / $dur" | bc -l)
+
+printf "iterations=%s\ntime_s=%s\nFLOPS=%s\n" "$n" "$dur" "$flops"
+

labs/lab2/scripts/test

@@ -0,0 +1,6 @@
+1
+2
+3
+4
+5
+6