Please note though, while being nice in a command line this may produce compatibility issues when the script will be moved to another platform. Such, in bash(1) words of the form $'string' are treated specially: bash$ grep $'\t' FILE. Some shells may offer advanced support for command typesetting. On most terminals this can be done through Ctrl V key combination which instructs terminal to treat the next input character literally (the V is for "verbatim"): $ grep ' ' FILE. However, when working in an interactive shell you may need to rely on shell and terminal capabilities to type the proper symbol into the line. This is straightforward when you edit a script file: # no tabs for Python please! Therefore, on Linux: $ grep -P '\t' FILE. Please consult UNIX utility man page to know which regex language it supports (hence the difference between sed(1), awk(1), and pcregrep(1) regular expressions). The atom is supported by BSD extended regular expressions ( egrep, grep -E on BSD compatible system), as well as Perl-compatible REs ( pcregrep, GNU grep -P).īoth basic regular expressions and Linux extended REs apparently have no support for the \t. In regex language the tab symbol is usually encoded by \t atom. The GNU grep(1) also supports Perl-compatible REs as provided by the pcre(3) library. Syntax is described in details on re_format(7) and regex(7) man pages which are part of BSD and Linux systems respectively. Modern grep(1) supports two forms of POSIX 1003.2 regex syntax: basic (obsolete) REs, and modern REs. ( Recommended) Use regular expression syntax supported by grep(1). There are basically two ways to address it:
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