Shell condition Test

The shell condition test can be done in two ways:

Test parameters Testing Content

[Parameter test content]

First, test file type:

TEST-E file name (test file exists)

[-e FileName] Test file exists, note the space on both sides of the bracket

Test-f file name to determine if it is normal

test-d file name to determine whether it is a directory

Test-b file name to determine if block device files

TEST-C file name to determine if the character device files

Second, test file permissions:

Test-r file name to determine whether or not to read permissions

TEST-W filename to determine whether the file and write permission

Test-x filename to determine if the file has Execute permission

Test-s file name to determine whether files are non-blank, content is true

Comparison of three, two files:

[File1-nt File2] file1 is newer than file2

[File1-ot File2] file1 is older than file2

[File1-et File2] Fie1 and file2 are linked files

Four, two arrays between the judgment:

[N1 EQ N2] N1 and N2 are equal

[N1 NE n2] N1 and N2 are not equal

[N1 GT N2] N1 is greater than N2

[N1 LT N2] N1 is less than N2

[N1 GE N2] N1 greater than or equal to N2

[N1 le N2] N1 is less than or equal to N2

Five, string judgment:

[-Z string] Determines whether the string is empty

[String 1 = = String 2] Determine if string 1 equals string 2

[String 1!] = string 2] Determine if string 1 is not equal to string 2

Shell condition Test