Introduction As often is the case in information technology there are new ways of referring to old concepts that have matured – this the case with the Internet of Things (IoT). Wired devices have communicated use signaling to exchange information since the early 20th century. For the last few decades Read more…
grep is used to search for PATTERN in each FILE or standard input. PATTERN is, by default, a basic regular expression (BRE). Example: grep -i ‘hello world’ menu.h main.c Usage: grep [OPTION]… PATTERN [FILE]… Regexp selection and interpretation: -E, –extended-regexp PATTERN is an extended regular expression (ERE) -F, –fixed-strings PATTERN Read more…
sed (stream editor) is a Unix utility that parses and transforms text, using a simple, compact programming language. $ sed -i ‘s/cat/dog/’ file.txt # this will replace any occurrence of the characters ‘cat’ by ‘dog’ Usage: sed [OPTION]… {script-only-if-no-other-script} [input-file]… -n, –quiet, –silent suppress automatic printing of pattern space -e Read more…
AWK is a pattern scanning and processing language. There are several implementations of AWK (mostly in the form of interpreters). AWK has been codified in POSIX. The main implementations in use today are: nawk (“new awk”, an evolution of oawk, the original UNIX implementation), used on *BSD and widely available on Linux; mawk, a fast implementation Read more…
VIM is the base text editor for Linux. It is the quickest way to edit your Bash scripts. There are two modes for VIM, 1. Insert mode (Where you can just type like a normal text editor. Press i for insert mode) 2. Command mode (Where you give commands to the Read more…