我翻了下 Bash 源码,找到了一段专门为这个行为写的注释: /* If there are no variables, save the text of the line read to the variable $REPLY. ksh93 strips leading and trailing IFS whitespace, so that `read x ; echo "$x"' and `read ; echo "$REPLY"' behave the same way, but I b...
A sequence of IFS whitespace characters is also treated as a delimiter. If the value of IFS is null, no word splitting occurs. IFS cannot be unset. Explicit null arguments ("" or '') are retained. Implicit null arguments, resulting from the expansion of parameters that have no values, ...
build: makefile whitespace tweaks (a0949de) test: bashrc comment and whitespace tweaks (27daf01) test: more thorough system location interference avoidance (7700896) test: set up BASH_COMPLETION_COMPAT_DIR in bashrc (only) (f7e2a41) test: reformat test_chromium_browser.py source (7bf6281) ...
Wrong. This works if a pathname has spaces in the middle, but it won’t work correctly if the pathname begins or ends with whitespace (they will get chopped off). Also, if a pathname includes “\”, it’ll get corrupted; in particular, if it ends in “\”, it will be combined wi...
Remove only leading whitespacesed 's/ *//' # notice a whitespace before '*'!!Remove ending commassed 's/,$//g'Add a column to the endsed "s/$/\t$i/" # $i is the valuable you want to add # To add the filename to every last column of the file for i in $(ls);do sed...
参见BashFAQ/001可以很好地解释为什么IFS= read -r是个好主意：它确保保留空格并且不解释反斜杠序列。
Doesn't use hyphens or brackets when formatting international phone numbers, only whitespace (seems more logical this way). Doesn't set .country to "001" when parsing "non-geographic" phone numbers (like mobile satellite communications services). Instead, .country is undefined in those cases, an...
diff fileA fileB --strip-trailing-cr 给文件编号 (例如给 fileA 编号) nl fileA #或者 nl -nrz fileA # add leading zeros #也可以 nl -w1 -s ' ' # making it simple, blank separate 使用tab 键按字段连接两个文件 (默认连接按照文件的第一列连接, 默认分隔符是空格) ...
"$opt" ]; then # we are at the beginning of a fresh block # remove optional leading hyphen and strip trailing whitespaces opt=$(echo "$1" | sed 's/^-\?\([a-zA-Z0-9\?-]*\)/\1/') fi # get the first character -> check whether long option first_chr=$(echo "$opt" | ...