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Full Discussion: what does | in grep do??
Top Forums Shell Programming and Scripting what does | in grep do?? Post 302382589 by pludi on Thursday 24th of December 2009 01:05:02 AM
Old 12-24-2009
Yes, it acts as an or. But it takes everything into consideration, including the spaces. So your first example means "look for the string 'd ' or the string ' a'", both of which do no appear. In the second example, the string ' d' does appear and resolves to a true value, thus printing the line.
 

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GO-LIST(1)						      General Commands Manual							GO-LIST(1)

NAME
go - tool for managing Go source code SYNOPSIS
go list [-e] [-f format] [-json] [ packages ] DESCRIPTION
List lists the packages named by the import paths, one per line. The default output shows the package import path: code.google.com/p/google-api-go-client/books/v1 code.google.com/p/goauth2/oauth code.google.com/p/sqlite OPTIONS
-f The -f flag specifies an alternate format for the list, using the syntax of package template. The default output is equivalent to -f '{{.ImportPath}}'. The struct being passed to the template is: type Package struct { Dir string // directory containing package sources ImportPath string // import path of package in dir Name string // package name Doc string // package documentation string Target string // install path Goroot bool // is this package in the Go root? Standard bool // is this package part of the standard Go library? Stale bool // would 'go install' do anything for this package? Root string // Go root or Go path dir containing this package // Source files GoFiles []string // .go source files (excluding CgoFiles, TestGoFiles, XTestGoFiles) CgoFiles []string // .go sources files that import "C" CFiles []string // .c source files HFiles []string // .h source files SFiles []string // .s source files SysoFiles []string // .syso object files to add to archive // Cgo directives CgoCFLAGS []string // cgo: flags for C compiler CgoLDFLAGS []string // cgo: flags for linker CgoPkgConfig []string // cgo: pkg-config names // Dependency information Imports []string // import paths used by this package Deps []string // all (recursively) imported dependencies // Error information Incomplete bool // this package or a dependency has an error Error *PackageError // error loading package DepsErrors []*PackageError // errors loading dependencies TestGoFiles []string // _test.go files in package TestImports []string // imports from TestGoFiles XTestGoFiles []string // _test.go files outside package XTestImports []string // imports from XTestGoFiles } -json The -json flag causes the package data to be printed in JSON format instead of using the template format. -e The -e flag changes the handling of erroneous packages, those that cannot be found or are malformed. By default, the list command prints an error to standard error for each erroneous package and omits the packages from consideration during the usual printing. With the -e flag, the list command never prints errors to standard error and instead processes the erroneous packages with the usual printing. Erroneous packages will have a non-empty ImportPath and a non-nil Error field; other information may or may not be miss- ing (zeroed). For more about specifying packages, see go-packages(7). AUTHOR
This manual page was written by Michael Stapelberg <stapelberg@debian.org>, for the Debian project (and may be used by others). 2012-05-13 GO-LIST(1)
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