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@ -120,7 +120,6 @@ $? :most recent foreground pipeline exit status.
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$- :current options set for the shell.
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$- :current options set for the shell.
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$$ :pid of the current shell (not subshell).
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$$ :pid of the current shell (not subshell).
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$! :is the PID of the most recent background command.
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$! :is the PID of the most recent background command.
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$_ :last argument of the previously executed command, or the path of the bash script.
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$DESKTOP_SESSION current display manager
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$DESKTOP_SESSION current display manager
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$EDITOR preferred text editor.
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$EDITOR preferred text editor.
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@ -306,8 +305,8 @@ echo "var=5;--var"| bc
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grep = grep -G # Basic Regular Expression (BRE)
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grep = grep -G # Basic Regular Expression (BRE)
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fgrep = grep -F # fixed text, ignoring meta-characters
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fgrep = grep -F # fixed text, ignoring meta-characters
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egrep = grep -E # Extended Regular Expression (ERE)
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egrep = grep -E # Extended Regular Expression (ERE)
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pgrep = grep -P # Perl Compatible Regular Expressions (PCRE)
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rgrep = grep -r # recursive
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rgrep = grep -r # recursive
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grep -P # Perl Compatible Regular Expressions (PCRE)
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```
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```
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##### Grep and count number of empty lines
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##### Grep and count number of empty lines
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