Вывод текста в цвете
echo -e "\e[1;31m This is red text \e[0m"
reset=, black=30, red=31,green=32, yellow=33, blue=34, magenta=35, cyan=36, and white=37.
$ cat /proc/12501/environ | tr ‘\0’ ‘\n’ HTTP_PROXY=http://192.168.0.2:3128 export HTTP_PROXY export PATH="$PATH:/home/user/bin"
Длина строки
$ var=12345678901234567890 $ echo ${#var} 20
Проверка суперпользователя
if [ $UID -ne 0 ]; then echo Non root user. Please run as root. else echo "Root user" fi
Перенаправление
cmd 2>&1 output.txt $ cmd 2>stderr.txt 1>stdout.txt #!/bin/bash cat <<EOF>log.txt LOG FILE HEADER This is a test log file Function: System statistics EOF
