Remove lines containing a string You can also use sed to delete all the lines that contain a given string or match a specific pattern. The command below will delete all the lines that contain the word 'string': sed -i '/string/d' filename Do note that this is a case-sensitive search...
man -l [-C file] [-d] [-D] [--warnings[=warnings]] [-R encoding] [-L locale] [-P pager] [-r prompt] [-7] [-E encoding] [-p string] [-t] [-T[device]] [-H[browser]] [-X[dpi]] [-Z] file ... man -w|-W [-C file] [-d] [-D] page ... man -c [-C ...
按列选取FILE的内容进行输出 -d : 列之间的分隔符,默认是TAB -f : 需要输出的列, 下面的指令是选择1,2列, 列之间是按照空格分开的 [work@st01-.com ngramgen]$ ll |cut-d''-f1,2total162924-rw-rw-r--1-rw-rw-r--1-rw-rw-r--1-rw-rw-r--1-rw-rw-r--1-rw-rw-r--1 -b: 每行...
However, they are set again upon next logging in. To permanently unset a variable you stored in a file, go to the file, and remove the line containing the variable definition. 修改已有的永久环境变量 How to Add a Directory to Your $PATH in Linux (howtogeek.com) 注意事项 ...
224 However, some such editors do not remove the whitespace if you end up not 225 putting a line of code there, such as if you leave a blank line. As a result, 226 you end up with lines containing trailing whitespace. 227 228 Git will warn you about patches that introduce trailing ...
(on|off) nv set system aaa nv set system aaa user <user-id> nv set system aaa user <user-id> ssh nv set system aaa user <user-id> ssh authorized-key <ssh-authorized-key-id> nv set system aaa user <user-id> ssh authorized-key <ssh-authorized-key-id> key <key-string> nv set...
Since the whitespace class[[:space:]]includes line breaks, /^[[:space:]]*$/ matches multiple blank lines. However, once a non-blank is read and appended into the pattern space, the string in the pattern space doesn’t match the pattern/^[[:space:]]*$/any longer. So, we break the...
.shstrtab:Section String Table段名表 .init, .fini: 程序初始化与终结代码段 .interp:This section holds the pathname of a program interpreter.For present,this is used to run the run-time dynamic linker to load the program and to link in any required shared libraries. ...
用OpenSSH的人都知ssh会把你每个你访问过计算机的公钥(public key)都记录在~/.ssh/known_hosts。当下次访问相同计算机时,OpenSSH会核对公钥。如果公钥不同,OpenSSH会发出警告,避免你受到DNS Hijack之类的攻击。
Furthermore, the line only containing four spaces, and the empty line, remain unchanged as they don’t contain any non-whitespace character. Similarly, we can get the same output with theawkcommand: $ awk '{sub(/\S\s*$/,"")}1' input.txt | cat -e This is a normal line$ This li...