Differences

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--- myhelp:bash [2023/05/03 12:20] – ulrich
+++ myhelp:bash [2024/03/07 12:12] (current) – ulrich
@@ Line 1: / Line 1: @@
-====== Read a file per line ======
+# Read a file per line
-<code># while read line; do echo "$line"; done < file.txt </code>
+```
+# while read line; do echo "$line"; done < file.txt
+```
+# Upper to Lower
-====== Upper to Lower ======
 Is pretty easy done
-<code># cat /path/to/file.txt|tr '[:upper:]' '[:lower:]'</code>
+```
+# cat /path/to/file.txt|tr '[:upper:]' '[:lower:]'
+```
 or
-<code># echo "LadiDA"|tr '[:upper:]' '[:lower:]'</code>
-====== SED Examples ======
+```
+# echo "LadiDA"|tr '[:upper:]' '[:lower:]'
+```
+# SED Examples
 Delete a line with a string in it. For example old ssh-keys:
-<code># sed -i "/myuser@old.laptop/d"  .ssh/authorized_keys </code>
-====== Calculate ======
+```
+# sed -i "/myuser@old.laptop/d"  .ssh/authorized_keys
+```
+# Calculate
 You can use the expr
-<code># expr 1 + 2</code>
+```
+# expr 1 + 2
+```
 and you will get 3 as result.
 Also some more fancy stuff is possible. For example in a for-loop:
-<code>for i in {1..9}; do echo "10.20.30.$(expr $i + 40)   servername-$i"; done</code>
-====== Bash redirection ======
+```
+for i in {1..9}; do echo "10.20.30.$(expr $i + 40)   servername-$i"; done
+```
+# Bash redirection
 stdout to file
-<code># command > file.txt</code>
+```
+# command > file.txt
+```
 stderr to file
-<code># command 2> /dev/null</code>
+```
+# command 2> /dev/null
+```
 stdout AND stderr to file
-<code># command &> file.txt</code>
+```
+# command &> file.txt
+```
 stdout to file AND stderr to file
-<code># command > file.txt 2> /dev/null</code>
+```
+# command > file.txt 2> /dev/null
+```
 stdout to stderr
-<code># command 1>&2</code>
+```
+# command 1>&2
+```
 stderr to stdout
-<code># command 2>&1</code>
-{{tag>[Good2Know bash]}}
+```
+# command 2>&1
+```