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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
code: | | ||
$ I=foobar | ||
$ echo ${I/oo/aa} #replacement | ||
faabar | ||
$ echo ${I:1:2} #substring | ||
oo | ||
$ echo ${I%bar} #trailing substitution | ||
foo | ||
$ echo ${I#foo} #leading substitution | ||
bar |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Использование случайных чисел | ||
code: | | ||
$ echo $((RANDOM % 15)) |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Проверка строки по регулярному выражению | ||
code: | | ||
if [[ "mystring" =~ REGEX ]] ; then | ||
echo match | ||
fi |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Использование массивов | ||
code: | | ||
#!/bin/bash | ||
|
||
array[0]="a string" | ||
array[1]="a string with spaces and \"quotation\" marks in it" | ||
array[2]="a string with spaces, \"quotation marks\" and (parenthesis) in it" | ||
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echo "There are ${#array[*]} elements in the array." | ||
for n in "${array[@]}"; do | ||
echo "element = >>${n}<<" | ||
done |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Посмотреть как будет выполняться скрипт | ||
code: | | ||
$ bash -x script.sh |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Исправление ошибок в последней команде | ||
code: | | ||
$ cat /proc/cupinfo | ||
cat: /proc/cupinfo: No such file or directory | ||
$ ^cup^cpu |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Использование булевых операторов в выражении | ||
code: | | ||
if [ 2 -lt 3 ] | ||
then echo "Numbers are still good!" | ||
fi | ||
|
||
if [[ 2 < 3 ]] | ||
then echo "Numbers are still good!" | ||
fi |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Проверить синтаксис скрипта без его выполнения | ||
code: | | ||
$ bash -n script.sh |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Подсчёт времени потраченного на выполнение | ||
code: | | ||
$ SECONDS=0; sleep 5 ; echo "that took approximately $SECONDS seconds" |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Использование арифметики | ||
code: | | ||
if [[ $((2+1)) = $((1+2)) ]] | ||
then echo "still ok" | ||
fi |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
code: | | ||
[lsc@home]$ export PROMPT_COMMAND="date" | ||
Fri Jun 5 15:19:18 BST 2009 | ||
[lsc@home]$ ls | ||
file_a file_b file_c | ||
Fri Jun 5 15:19:19 BST 2009 | ||
[lsc@home]$ ls |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Добавить параметры предыдущей команды | ||
code: | | ||
$ ls /var/cache/ | ||
fontconfig hald ldconfig man pacman | ||
$ cd <Alt+.> | ||
$ cd /var/cache |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Редактировать текущую команду в редакторе | ||
code: | | ||
$ ls -l <ctrl+x><ctrl+e> |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
code: | | ||
Поместить курсор в начало/конец строки | ||
Ctrl + a / Ctrl + e | ||
|
||
Поменять местами текущий и предыдущий символ/слово | ||
Ctrl + t / Alt + t | ||
|
||
Поменять в верхний/нижний регистр всё от текущей | ||
позиции до конца слова | ||
Alt + u / Alt + l |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Отчистить файл | ||
code: | | ||
$ > file |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Использование базовых математических операций. | ||
code: | | ||
$ A=10 | ||
$ let B="A * 10 + 1" # B=101 | ||
$ let B="B / 8" # B=12 | ||
$ let B="(RANDOM % 6) + 1" # B от 1 до 6 |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: | | ||
Первая команда удаляет из истории баша все дубликаты | ||
Вторая увеличивает объём истории | ||
code: | | ||
$ export HISTCONTROL=erasedups | ||
$ export HISTSIZE=1000 |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Вырубать баш после 15 минут простоя | ||
code: | | ||
$ export TMOUT=$((15*60)) |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Раскрыть подстановки в выражениях | ||
code: | | ||
$ rm -r source/d*.c <Alt + *> | ||
$ rm -r source/delete_me.c source/do_not_delete_me.c |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Развернуть переменные и алиасы | ||
code: | | ||
$ ls $HOME/tmp <Ctrl Alt + e> | ||
$ ls -N --color=tty -T 0 /home/cramey |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Вызывать команды из команд. | ||
code: | | ||
$ hostname && dig +short $(hostname) && dig +short -x $(dig +short $(hostname)) |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Вызывать переменные-переменные | ||
code: | | ||
$ foo=bar | ||
$ baz=foo | ||
$ echo ${!baz} | ||
bar |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Выполнить вторую команду с конца истории | ||
code: | | ||
$ ls -l foo bar | ||
$ touch foo bar | ||
$ !-2 |
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link: http://user.su/index.php/Bash:Основы | ||
desc: Массивы | ||
code: | | ||
array[0]=тест1 | ||
array[1]=тест2 | ||
|
||
echo ${#array[0]} # Длина первого элемента массива | ||
echo ${#array[*]} # Число элементов в массиве | ||
echo ${#array[@]} # Число элементов в массиве | ||
echo ${array[@]:0} # Все элементы массива | ||
echo ${array[@]:1} # Все эелементы массива, начиная со 2-го | ||
|
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area=( ноль один два три четыре ) | ||
a=( '' ) # "a" имеет один пустой элемент | ||
hash=( [0]="первый" [1]="второй" [3]="четвертый" ) |
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link: http://user.su/index.php/Bash:Основы | ||
desc: | | ||
Элементы массива разделяются пробелами | ||
Для обработки строк, как элементов массива | ||
нужно на время изменить разделитель: | ||
code: | | ||
LD_IFS="$IFS" | ||
IFS=$'\n' | ||
|
||
declare -a a | ||
a=( $(cat "file.txt") ) | ||
echo "Total:" ${#a[@]} | ||
for i in "${a[@]}" | ||
do | ||
echo "$i" | ||
done | ||
|
||
IFS="$OLD_IFS" |
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link: http://user.su/index.php/Bash:Основы | ||
desc: Арифметические операторы | ||
code: | | ||
+ сложение | ||
- вычитание | ||
* умножение | ||
/ деление | ||
** возведение в степень | ||
% модуль, остаток от деления | ||
|
||
+= | ||
-= | ||
/= | ||
*= | ||
%= |
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link: http://user.su/index.php/Bash:Основы | ||
desc: Битовые операторы | ||
code: | | ||
<< сдвигает на 1 бит влево (умножение на 2) | ||
<<= сдвиг-влево-равно | ||
>> сдвиг вправо на 1 бит (деление на 2) | ||
>>= сдвиг-вправо-равно (имеет смысл обратный <<=) | ||
& по-битовое И (AND) | ||
&= по-битовое И-равно | ||
| по-битовое ИЛИ (OR) | ||
|= по-битовое ИЛИ-равно | ||
~ по-битовая инверсия | ||
! по-битовое отрицание | ||
^ по-битовое ИСКЛЮЧАЮЩЕЕ ИЛИ (XOR) | ||
^= по-битовое ИСКЛЮЧАЮЩЕЕ-ИЛИ-равно |
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link: http://user.su/index.php/Bash:Основы | ||
desc: Логические операторы | ||
code: | | ||
&& логическое И (and) | ||
|| логическое ИЛИ (or) |
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link: http://user.su/index.php/Bash:Основы | ||
desc: Длина строки | ||
code: | | ||
${#string} | ||
expr length $string | ||
expr "$string" : '.*' |
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link: http://user.su/index.php/Bash:Основы | ||
desc: Длина подстроки в строке | ||
code: | | ||
expr match "$string" '$regsubstring' | ||
expr "$string" : '$regsubstring' |
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link: http://user.su/index.php/Bash:Основы | ||
desc: Специальные переменные | ||
code: | | ||
$# количество аргументов командной строки | ||
$* и $@ содержат все аргументы командной строки | ||
$0 $1 $2 ${10} позиционные параметры | ||
$? код завершения последней выполненной команды, функции или сценария | ||
$$ id процесса | ||
$! pid последнего, запущенного в фоне, процесса | ||
$_ последний аргумент предыдущей команды |
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link: http://user.su/index.php/Bash:Основы | ||
desc: Перенаправление вывода | ||
code: | | ||
COMMAND_OUTPUT > # Перенаправление stdout (вывода) в файл. | ||
: > filename # Операция > усекает файл "filename" до нулевой длины (аналог команды touch) | ||
> filename # Операция > усекает файл "filename" до нулевой длины | ||
COMMAND_OUTPUT >> # Перенаправление stdout (вывода) в файл в режиме добавления | ||
1>filename # Перенаправление вывода (stdout) в файл "filename" | ||
1>>filename # Перенаправление вывода (stdout) в файл "filename", добавление | ||
2>filename # Перенаправление stderr в файл "filename" | ||
2>>filename # Перенаправление stderr в файл "filename", добавление | ||
&>filename # Перенаправление stdout и stderr в файл "filename" | ||
2>&1 # Перенаправляется stderr на stdout | ||
i>&j # Перенаправляется файл с дескриптором i в j | ||
>&j # Перенаправляется файл с дескриптором 1 (stdout) в файл с дескриптором j | ||
0< FILENAME # Ввод из файла | ||
< FILENAME # Ввод из файла |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Использовать аргументы предыдущей команды | ||
code: | | ||
$ ls -l foo | ||
$ touch !:2 | ||
$ cp !:1 bar |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Использование аргументов одной из предыдущих команд | ||
code: | | ||
$ ls -l foo bar | ||
$ touch !:2 !:3 | ||
$ rm !-2:2 !-2:3 | ||
$ !-3 |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Подставить все аргументы предыдущей команды | ||
code: | | ||
$ ls -l foo bar | ||
$ ls !* |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Использовать первый аргумент предыдущей команды | ||
code: | | ||
$ ls /tmp /var | ||
$ ls !^ |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Использовать последний аргумент предыдущей команды | ||
code: | | ||
$ ls /tmp /var | ||
$ ls !$ |
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link: http://stackoverflow.com/questions/211378/hidden-features-of-bash | ||
desc: Посмотреть какая команда будет выполнена: | ||
code: | | ||
$ ls /var /tmp | ||
$ ls !$ <alt+shift+6> | ||
$ ls /tmp |
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@@ -0,0 +1,12 @@ | ||
link: http://user.su/index.php/Bash:Основы | ||
desc: Условия if | ||
code: | | ||
if [ condition ] | ||
then | ||
command | ||
elif [ condition ] | ||
then | ||
command | ||
else | ||
command | ||
fi |
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link: http://user.su/index.php/Bash:Основы | ||
desc: Логические операторы в условиях | ||
code: | | ||
if [ $condition1 ] && [ $condition2 ] ... | ||
if [[ $condition1 && $condition2 ]] ... |
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link: http://user.su/index.php/Bash:Основы | ||
desc: Ветвления case | ||
code: | | ||
case ABC in | ||
condition1) | ||
command | ||
;; | ||
condition2) | ||
command | ||
;; | ||
esac |
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ветвление |
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link: http://user.su/index.php/Bash:Основы | ||
desc: Сравнения чисел | ||
code: | | ||
[ A -eq B ] # равно | ||
[ A -ne B ] # не равно | ||
[ A -gt B ] | ||
[ A -lt B ] | ||
[ A -ge B ] | ||
[ A -le B ] | ||
(( A < B )) | ||
(( A <= B )) | ||
(( A > B )) | ||
(( A >= B )) |
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link: http://user.su/index.php/Bash:Основы | ||
desc: Сравнения строк | ||
code: | | ||
[ A = B ] | ||
[ A == B ] | ||
[ A != B ] | ||
[ A \< B ] | ||
[ A \> B ] | ||
[ -z A ] # строка пустая? | ||
[ -n A ] # строка не пустая? |
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