get "grep" matched string

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Dear Ladies & Gents, I have a requirement to delete all the log files in /var/log/test directory that are older than 10 days and their first line begin with "MSH" or "<?xml" or "FHS". I've put together the following BASH script, but it's erroring out: for filename in $(find /var/log/test...

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Grep all lines with the string "TNS-" but skip those with "TNS-12514"

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grep regex, match exact string which includes "/" anywhere on line.

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input string="3MMTQSZ348GGMZRQWMJM4SD6M";output string="3MMTQ-SZ348-GGMZR-QWMJM-4SD6

input string="3MMTQSZ348GGMZRQWMJM4SD6M" output string="3MMTQ-SZ348-GGMZR-QWMJM-4SD6M" using linux shell script

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Explain the line "mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'`"

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Shell Programming and Scripting