In this post, we will look at few Regular expressions to get first or last few characters from a string. This tip is very useful to use in bash shell scripts. Way 1 This is the method i used to prefer since i r
#!/bin/bash #: Description : print formatted sales report ## Build a long string of equals signs divider=== divider=$divider$divider ## Format strings for printf header="\n %-10s %11s %8s %10s\n" format=" %-10s %11.2f %8d %10.2f\n" ## Width of divider totalwidth=44 ## Pri...
characters `:', ` ', `\t', `\n', and sometimes `?'. So you might call this function like: line = get_history_event ("!echo:p", &index, 0); */char*get_history_event(string, caller_index, delimiting_quote)constchar*string;int*caller_index;intdelimiting_quote; {registerinti;regis...
3 4 5 6 7 echo"Do you wish to install this program?" selectynin"Yes""No";do case$ynin Yes)makeinstall;break;; No)exit;; esac done 使用select,您不需要清理输入–它会显示可用的选项,并键入与您的选择相对应的数字。它也会自动循环,因此如果提供的输入无效,则不需要while true循环重试。 另外,...
{nvm_path}"/.nvmrc) declare locally_resolved_nvm_version # `nvm ls` will check all locally-available versions # If there are multiple matching versions, take the latest one # Remove the `->` and `*` characters and spaces # `locally_resolved_nvm_version` will be `N/A` if no local ...
# holds the name of the program being run. You can get this # value from the first item on the command line ($0). # Reference: This was copied from <http://www.linuxcommand.org/wss0150.php> PROGNAME=$(basename$0) functionerror_exit ...
.sh #!/bin/bash # This is a simple script that you can use for converting text into HTML. # First we take outall newline characters, so that the appending only happens # once, then we replace the newlines. echo "converting 1..." SCRIPT="/home/sandyscripts/script.sed" NAME="...
Let’s break down what’s going on in the Bash script you just created. Bash executes programs in order from the first line in your file to the last line. Theexprcommand can be used toevaluateBashexpressions. An expression is just a valid string of Bash code that, when run, produces ...
DEFINITIONS The following definitions are used throughout the rest of this document. blank A space or tab. word A sequence of characters considered as a single unit by the shell. Also known as a token. name A word consisting only of alphanumeric characters and underscores, and beginning with...
STRING="HELLO WORLD!!!" echo $STRING 1. 2. 3. Your backup script and variables: #!/bin/bash OF=myhome_directory_$(date +%Y%m%d).tar.gz tar -czf $OF /home/linuxconfig 1. 2. 3. 3.1. Global vs. Local variables #!/bin/bash ...