$ checkarg /home/chris/bin/checkarg: line 10: 1: An argument is required $ checkarg x /home/chris/bin/checkarg: line 10: 2: Two arguments are required $ checkarg '' '' /home/chris/bin/checkarg: line 13: 1: A non
However, let’s see a simpler approach to doing this check. 4. Using thegrepCommand with the-qOption When we pass the-qoption to thegrepcommand,grepwill output nothing. But, if the given pattern is not matched, thegrepcommand exits with code 1. Otherwise, it returns with the exit code...
echo "grep the pid:" # ps ax|grep -E "^\s*$$";echo $? echo "---check the current process ,check the shell interpreter" long_name=$(ps ax|grep -E "^\s*$$";echo $?) echo $long_name # 简单处理,指定显示comm(仅显示可执行程序命令名: command name (only the executable name)....
includes aliases, builtins, and functions,ifand onlyifthe `-p'option is not also used-f suppress shellfunctionlookup-P force a PATH searchforeach NAME, evenifit is an alias, builtin, orfunction, and returns the name of the diskfilethat would be executed-p returns either the name of th...
kubernetes 即使不满足条件也执行函数体时执行Bash [重复]此if条件 如果“$status”！=“正在运行”||...
test_arp: Skip if ARP tables are empty (90ede98) test: generalize check whether we're being run in a container (1e3d3b4) test_feh, test_makepkg: invoke grep as "command grep" (5e706a4) test_getconf: skip if -a doesn't output any POSIX_V* (70afc1e) test_iconv: skip option ...
1 #!/bin/bash2 # rpm-check.sh3 4 # 这个脚本的目的是为了描述,列表,和确定是否可以安装一个rpm包.5 # 在一个文件中保存输出.6 # 7 # 这个脚本使用一个代码块来展示8 9 SUCCESS=010 E_NOARGS=6511 12 if [ -z "$1" ]13 then14 echo "Usage: `basename $0` rpm-file"...
standard commands for GNU autotools packages: ./configure make make check # optional, requires dejagnu and tcllib make install # as root These commands installs the completions and helpers, as well as a profile.d script that loads bash_completion where appropriate. If your system does not use...
Globbing in shell returns junk (the pattern) when there are zero matches. There should be a shell option (typically called a “nullglob” option) so an empty list is returned if nothing matches and there was at least one metacharacter. Oddly enough, the underlying glob() function has an ...
Parsing a sitemap to see an overview of a site's is often the first step towards scraping a website. This guide demonstrates how to do so using nothing more than bash and common command-line utilities like curl, xargs, sed, grep, and gunzip.