首先,在FOR循环之前打印Before Loop,然后循环开始。FOR循环以for [variable name] in [sequence]的语法开头,然后是下一行的do。在for之后立即定义的变量名将在循环内部接受一个值,该值对应于在in之后提供的序列中的一个元素,从序列的第一个元素开始,然后是每个后续元素。有效序列包括大括号展开、字符串的显式列表...
progname=${0##*/} ## Get the name of the script without its path ## Default values verbose=0 filename= ## List of options the program will accept; ## those options that take arguments are followed by a colon optstring=f:v ## The loop calls getopts until there are no more options...
You do not need to add these lines to your file, though you should type exactly what I have typed below these lines.Note: please type all of the lines out for every program that we’re going to write, do not copy and paste. Typing code is a little different from typing an email, ...
is left in the globval variable GLOBAL_COMMAND for use by reader_loop. This is where the shell timeout code is executed. */intread_command(){...result=parse_command();...return(result);}.../* Call the YACC-generated parser and return the status of the parse. Input is read from t...
15 echo "The value of \"a\" is now $a."16 17 echo18 19 # 在for循环中20 echo -n "Values of \"a\" in the loop are: "21 for a in 7 8 9 1122 do23 echo -n "$a "24 done25 26 echo27 echo28 29 # 在read命令状态中...
Use done to end the for loop. Use IFS Variable 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 #!/bin/bash function return_array(){ local array=(1 2 3 4 5) echo "${array[@]}" } IFS=' ' entire_array=$(return_array) individual_elements=($entire_array) for i in "${!
You can iterate through the elements of a Bash array using aforloop. Here’s how: # Looping through an arrayforcountryin"${countries[@]}"doecho$countrydone# Output:# 'USA'# 'Canada'# 'Australia' Bash Copy In this example, we looped through thecountriesarray and printed each element on...
return $E_PARAM_ERR # No damage done. fi lineno=$2 if [ ! $1 ] then echo "Assertion failed: "$1"" echo "File "$0", line $lineno" # Give name of file and line number. exit $E_ASSERT_FAILED # else # return # and continue executing the script. fi } # Insert a similar...
The exit status of a pipeline is normally the exit status of the last command in the pipeline. The shell will not return a status until all the commands in the pipeline have completed. If you want your pipelines to be considered a failure if any of the commands in the pipeline fail, ...
for func in ${FUNCNAME[@]} do echo func=$func stack=$(echo $func $stack) done echo funs="$stack" echo arg1="$first" echo args="$*" return 1}# get type of testtype test# execute functiontest aaa bbb# fetch the retuen value of functionecho $? 需要注意的是,函数没有$0说法,在b...