Question

Два скрипта . Линукс 1)Create script using pico which will output the number of days passed since the beginning of the year. 2)Create script which will ask user to provide a value and then, according to the value provided: 1 - set some environmental variable 2 - output this environmental variable 3 - erase this environmental variable 4 - exit without errors Any other - exit with error

Answer 1

Ответ:

Объяснение:

1:

#!/usr/bin/env bash

echo date '+%j'

2: Нужна переменная сессионная или именно что окружения для всех?

#!/usr/bin/env bash

echo "Введите слово";

read Var1;

echo $Var1;

unset Var1;

exit 0;

Answer 2

Here are two Linux shell scripts to accomplish the tasks you described:

1. Create a script to calculate the number of days passed since the beginning of the year:

bashCopy code
#!/bin/bash

# Get the current date in the format YYYY-MM-DD
current_date=$(date +%F)

# Extract the year and day of the year from the date
year=$(date -d "$current_date" +%Y)
day_of_year=$(date -d "$current_date" +%j)

# Calculate the number of days passed since the beginning of the year
days_passed=$((day_of_year))

echo "Number of days passed since the beginning of the year in $year: $days_passed"

Save this script as, for example, days_passed.sh, and make it executable with chmod +x days_passed.sh. You can run it with ./days_passed.sh.

2. Create a script to handle user input for setting, outputting, or erasing an environmental variable:

bashCopy code
#!/bin/bash

echo "Enter a choice:"
echo "1 - Set an environmental variable"
echo "2 - Output an environmental variable"
echo "3 - Erase an environmental variable"
echo "4 - Exit without errors"
echo "Any other - Exit with an error"

read choice

case $choice in
    1)
        echo "Enter the name of the environmental variable:"
        read var_name
        echo "Enter the value for $var_name:"
        read var_value
        export "$var_name=$var_value"
        echo "Environmental variable $var_name set to $var_value"
        ;;
    2)
        echo "Enter the name of the environmental variable to output:"
        read var_name
        echo "$var_name=${!var_name}"
        ;;
    3)
        echo "Enter the name of the environmental variable to erase:"
        read var_name
        unset "$var_name"
        echo "Environmental variable $var_name erased"
        ;;
    4)
        echo "Exiting without errors."
        exit 0
        ;;
    *)
        echo "Error: Invalid choice."
        exit 1
        ;;
esac

Save this script as, for example, env_variable_manager.sh, and make it executable with chmod +x env_variable_manager.sh. You can run it with ./env_variable_manager.sh.

These scripts should fulfill the tasks you outlined.