Linux Shell string Cutting built-in method

$MYSTR ="node=slave-01:2.05:1.25:1.00"$ time tmp=${mystr%%:*}; echo ${tmp##*=}real    0m0.000suser    0m0.000ssys     0m0.000sslave-

${string#*pattern} minimizes matching pattern from the left and deletes (starting from the left) the first pattern and its left string

${string##*pattern} maximizes match pattern from the left and deletes (starting from the left) the last pattern and its left string

${string%pattern*} minimize match pattern from the right and delete (starting from the right) the first pattern and the string to the right (from the back forward)

${string%%pattern**} maximizes match pattern from the right and deletes (starting from the right) the last pattern and the string to the right (from the back forward)

#是去掉左边

% is to remove right

Single minimum match, two maximum matches

echo ${mystr:0:5}node=echo ${mystr:5:5 }slave

${string:start:length} (0 start count)

Contains the first start element, taking the element (START+LENGTH-1)

$echo ${mystr/:/_}node=slave-01_2. to:1.25:1.00echo ${mystr//:/_}node=slave-01_2.05 _1.25_1. xx

${string/old/new} replaces the first old with the new one

${string//old/new} Replaces all old with new

Old contains/time with \ Escape

Linux Shell string Cutting built-in method