Now, let’s trim extra whitespace by squeezing multiple spaces into one: $echo" welcome to baeldung "| sed -r's/[[:blank:]]+/ /g'welcome to baeldung Using the +, we managed to identify occurrences of one or more spaces. Then, we replaced it with only one space. ...
string. Substrings matched by parenthesized subexpressions within the regular expression are saved in the array variable BASH_REMATCH. The element of BASH_REMATCH with index 0 is the portion of the string matching the entire regular expression. The element of BASH_REMATCH with index n is the p...
PROMPT_DIRTRIM If set to a number greater than zero, the value is used as the number of trailing directory components to retain when expanding the \w and \W prompt string escapes (see PROMPTING below). Characters removed are replaced with an ellipsis. PS1 The value of this parameter is ...
__bp_sanitize_string() { localvar=${1:?}text=${2:-}sanitized __bp_trim_whitespace sanitized"$text" sanitized=${sanitized%;} sanitized=${sanitized#;} __bp_trim_whitespace sanitized"$sanitized" printf-v"$var"'%s'"$sanitized" }
最后是rtrim、trim和echo2(输出到标准错误)函数: rtrim() { local var=$@ var="${var%"${var##*[![:space:]]}"}" # remove trailing whitespace characters echo -n "$var" } trim() { local var=$@ var="${var#"${var%%[![:space:]]*}"}" # remove leading whitespace characters var...
(test suite): Avoid interference from user and system dirs (#87) (1d3b6da) (test suite): Accept non-whitespace single word in assert_complete_any (476b260) (test suite): Load tested completions dynamically (7fa35af) arch: Parse options from --help (ca31dfa) (test suite): Add mailma...
If offset evaluates to a number less than zero, the value is used as an offset from the end of the value of parameter. Arithmetic expressions starting with a - must be separated by whitespace from the preceding : to be distinguished from the Use Default Values expansion. If length evaluates...
For example, the “EOF” is just a convention, the terminator can be an arbitrary string, something like “THISISTHEEND” also works. And using<<-trims leadingtabcharacters (but not other whitespace), so you can indent the lines, but only with tabs. Substitutions (variables, commands) are...
Variables are assigned values using the = operator. There may not be any whitespace between the variable name and the value. You can make multiple assignments on the same line by separating each one with whitespace: firstname=Arnold lastname=Robbins numkids=4 numpets=1 ...
replace leading whitespace with a comma and add it to the history - if the input is the start of a record, trim the header, swap the history, and print the one-line history - same process for the last input line Solution 4: Process the first record differently, directly print $3. It...