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--- sed:remove_whitespace_from_a_file [2019/12/10 18:30] – [Remove all whitespace (including tabs) from beginning of string] peter
+++ sed:remove_whitespace_from_a_file [2019/12/10 18:33] (current) – removed peter
@@ Line 1: / Line 1: @@
-====== SED - Remove whitespace from a file ======
-===== Delete whitespace from begin of each line =====
-<code bash>
-cat input.txt | 's/^[ \t]*//' > output.txt
-</code>
-----
-===== Delete trailing whitespace from end of each line =====
-<code bash>
-cat input.txt | sed 's/[ \t]*$//' > output.txt
-</code>
-----
-===== Remove leading and trailing whitespace from each line =====
-<code bash>
-cat input.txt | sed 's/^[ \t]*//;s/[ \t]*$//' > output.txt
-</code>
------
-===== Remove all whitespace (including tabs) from beginning of string =====
-<code bash>
-echo "     This is a test" | sed -e 's/^[ \t]*//'
-</code>
-result:
-<code bash>
-This is a test
-</code>
-Where,
-  * **s/** : Substitute command ~ replacement for pattern (^[ \t]*) on each addressed line
-  * **^[ \t]*** : Search pattern ( ^ – start of the line; [ \t]* match one or more blank spaces including tab)
-  * **//** : Replace (delete) all matched pattern
-----