向非稀疏格式格式数组中追加元素:ARRAY_NAME[${#ARRAY_NAME[*]}]= 删除数组中的某元素:unset ARRAY[INDEX] 关联数组:declare -A ARRAY_NAME ARRAY_NAME=([index_name1]="value1" [index_name2]="value2" ...) 2.bash中字符串处理 2.1 字符串切片: ${var:offset:number} 取字符串的子串; 取字符串...
AI代码解释 [xiaoqi@study~]$ echo $variable[xiaoqi@study~]$ echo $PATH/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/xiaoqi/.local/bin:/home/xiaoqi/bin[xiaoqi@study~]$ echo ${PATH}#使用这种方法获取变量比较规范/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/xiaoq...
tion,declareandtypeset makeeachname local,aswiththe local command, unless the -goptionissup‐ plied.Ifa variable nameisfollowedby=value, the valueofthe variableissettovalue.Whenus‐ ing -aor-Aandthe compound assignment syntaxtocreate array variables, additional attributesdonottakeeffectuntilsubsequent...
declare -F可以输出所有已经定义的函数名,不含函数体。 函数体内不仅可以声明全局变量,还可以修改全局变量。 函数里面可以用local命令声明局部变量。 Bash 函数定义的语法有两种。 # 第一种 fn() { # codes } hello() { echo "Hello $1" } $ hello world Hello world 函数体里面的$1表示函数调用时的第一...
但是也有特例,就是如果在某个函数中,显示定义了local,那么该变量仅在函数内部起作用。或者利用declare或typeset在某个函数中定义的变量,其也是局部变量。 可以看个例子: #!/usr/bin/env bashfunctionttt(){declarea=5b=5localc=5echoa=$aechob=$bechoc=$c}tttechoa=$aechob=$bechoc=$c ...
# Declare array declare -a ARRAY # Link filedescriptor 10 with stdin exec 10<&0 # stdin replaced with a file supplied as a first argument exec < $1 let count=0 while read LINE; do ARRAY[$count]=$LINE ((count++)) done echo Number of elements: ${#ARRAY[@]} ...
alias cp='cp -i'alias egrep='egrep --color=auto'alias fgrep='fgrep --color=auto'alias grep='grep --color=auto'alias l.='ls -d .* --color=auto'alias ll='ls -l --color=auto'alias ls='ls --color=auto'alias mv='mv -i'alias rm='rm -i'alias which='(alias; declare -f) ...
Bash Associative Array (dictionaries, hash table, or key/value pair) You cannot create an associative array on the fly in Bash. You can only use the declare built-in command with the uppercase “-A” option. The += operator allows you to append one or multiple key/value to an associati...
declare -A tmp_array for i in "$@"; do [[ $i ]] && IFS=" " tmp_array["${i:- }"]=1 done printf '%s\n' "${!tmp_array[@]}" } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 用法示例: $ remove_array_dups 1 1 2 2 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5 5 ...
Inside the function, we declare a local variable named 'inside_variable' and assign it a value. We then call the function "my_function", which prints the value of 'inside_variable' inside the function. Outside the function, we try to access the variable 'inside_variable' and print its ...