“` # Get the first command line argument echo “The first argument is: $1” “` 5. 条件语句:在脚本中使用条件语句判断某些条件是否满足,并根据判断结果执行相应的操作。常见的条件语句有if、elif、else和case。例如: “` # Conditional statement if [[ $name == “John” ]]; then echo “Hello,...
:adouble-quoted single quote,'::adouble-quoteddoublequote,":$ ./sa'a single-quoted double quotation mark, "':a single-quoteddoublequotation mark,":$ ./sa"First argument"'still the first argument':First argument still the first argument: $echo'\'line1\'\n\'line2\''# 单引号中直接嵌套...
}/* Try to get FIRST and LAST figured out. */if(spec[i] =='-') first =0;elseif(spec[i] =='^') { first =1; i++; }elseif(_rl_digit_p (spec[i]) && expecting_word_spec) {for(first =0; _rl_digit_p (spec[i]); i++) first = (first *10) + _rl_digit_value (s...
bash shell 脚本执行的方法有多种,本文作一个总结,供大家学习参考。 假设我们编写好的shell脚本的文件名为hello.sh,文件位置在/data/shell目录中并已有执行权限。...方法二:以绝对路径的方式去执行bash shell脚本: /data/shell/hello.sh 方法三:直接使用bas...
是一种常见的操作,它允许我们在执行脚本时向脚本传递一些值或者参数。通过使用这些参数,我们可以在脚本中根据不同的需求执行不同的操作。 在bash脚本中,我们可以通过特殊变量$1、$2、$3等来获取传递给脚本的参数。其中,$1表示第一个参数,$2表示第二个参数,以此类推。如果有超过9个参数,可以使用大括号来获取,例...
# 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[@]} # echo array's content echo ${ARRAY[@]} # restore stdin from filedescriptor 10 ...
!!:n # Expand only nth token from most recent command (command is 0; first argument is 1) !^ # Expand first argument from most recent command !$ # Expand last token from most recent command !!:n-m # Expand range of tokens from most recent command !!:n-$ # Expand nth token to...
#!/usr/bin/bash # example.sh fn() { echo "My function first argument is ${1}"; } echo "My script first argument is ${1}" fn ${2} # Example output [me@linux ~]$ ./example.sh A B My script first argument is A My function first argument is B By using parameter expansions...
Instead of prompting the user for the filename, we can make the user simply pass the filename as a command line argument while running the script as follows: ./count_lines.sh /etc/passwd The first bash argument (also known as a positional parameter) can be accessed within your bash scrip...
gcp_secret_update.sh - reads a value from a command line argument or non-echo prompt and updates a given GCP Secrets Manager secret. Useful for uploading a password without exposing it on your screen gcp_secret_get.sh - finds the latest version of a given GCP Secret Manager secret and re...