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Similar to the traditional `grep` command.
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`grep -h`{{execute T2}}
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```bash
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USAGE:
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grep [-A <value>] [-B <value>] [-C <value>] [-h] [-i] [-v] [-n] [-m <value>] [-e] [--trim-end] pattern
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SUMMARY:
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grep command for pipes.
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EXAMPLES:
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sysprop | grep java
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sysprop | grep java -n
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sysenv | grep -v JAVA
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sysenv | grep -e "(?i)(JAVA|sun)" -m 3 -C 2
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sysenv | grep JAVA -A2 -B3
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thread | grep -m 10 -e "TIMED_WAITING|WAITING"
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WIKI:
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https://arthas.aliyun.com/doc/grep
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OPTIONS:
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-A, --after-context <value> Print NUM lines of trailing context)
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-B, --before-context <value> Print NUM lines of leading context)
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-C, --context <value> Print NUM lines of output context)
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-h, --help this help
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-i, --ignore-case Perform case insensitive matching. By default, grep is case sensitive.
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-v, --invert-match Select non-matching lines
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-n, --line-number Print line number with output lines
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-m, --max-count <value> stop after NUM selected lines)
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-e, --regex Enable regular expression to match
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--trim-end Remove whitespaces at the end of the line
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<pattern> Pattern
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```
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## Example
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### Print matched lines
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`sysprop | grep java`{{execute T2}}
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### `-n` to show line numbers
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`sysprop | grep java -n`{{execute T2}}
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### `-v` to show non-matching lines
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`sysenv | grep -v JAVA`{{execute T2}}
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### `-e` to enable regular expression to match，`-m` stop after the specified number of selected lines
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`sysenv | grep -e "(?i)(JAVA|sun)" -m 3 -C 2`{{execute T2}}
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`thread | grep -m 10 -e "TIMED_WAITING|WAITING"`{{execute T2}}
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### `-A` to print specified line number of trailing context，`-B` to print specified line number of leading context
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`sysenv | grep JAVA -A2 -B3`{{execute T2}}
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