--- tags: - Shellcategories: - Linuxdate:created: 2020-09-11# updated: 2024-01-19---

Shell string interception¶

Format	illustrate
${string: start :length}	Starting from the start character on the left side of the string string, intercept length to the right.
${string: start}	Intercept from the start character on the left side of the string string until the end
${string: 0-start :length}	Starting from the start character on the right side of the string string, intercept length to the right.
${string: 0-start}	Intercept from the start character on the right side of the string string until the end
${string#*chars}	Starting from the first occurrence of chars in the string string, intercept chars
${string##*chars}	Starting from the last occurrence of chars in the string string, intercept chars
${string%*chars}	Starting from the first occurrence of chars in the string string, intercept chars
${string%%*chars}	Starting from the last occurrence of chars in the string string, intercept chars

REF[1]. Linux-A brief analysis of text processing commands ¶