How to handle dynamic shell in linux

Linux dynamic shell processing method 1. source use ① execution File source $ {filename} ② standard Force source & lt; (echo & quot; xxxxxxx & quot;) Note: The executed command must be clean, note 2.awk& amp; lsquo; $8 $8... linux dynamic shell processing method 1. source use ① execution File source $ {filename} ② standard force input source <(echo "xxxxxxx") Note: The executed command must be clean, it cannot be annotated as it is written in a script. awk '$8 = $ 8' is the same as the tee ① awk column [html] if [! -Z $ sex] & [! "$ Sex"-eq "2"]; then sexCmd = 'awk $8 = '$ {sex} else sexCmd = 'awk $8 = $ 8' fi ② tee [plain] if [! -Z $ sex] & [! "$ Sex"-eq "2"]; then sexCmd = 'awk $8 ===' $ {sex} else sexCmd = 'Tee 'fi is dynamically spliced to run the command [plain] cat $ {tbld}/KOKYAKU_MASTER | $ {kokyakuidCmd} | $ {sexCmd} | $ {nenreiCmd} | $ {nendaiCmd} | $ {gurupuCmd} tested: compared with awk, tee saves quite a lot of time in dynamic splicing. the most disgusting thing is single quotes. this is a strong reference of input. you must control a stupid way: in dynamic concatenation, two single quotes are equivalent to a single quotation mark (the same as the dynamic concatenation of MSSQL), because in the test, the following is found when the sexCmd variable is assigned a value: [html] + sexCmd = 'awk $8 = 1, automatically becomes the valid awk execution method [plain] + cat/BSK/TBL/KOKYAKU_MASTER + tee + awk '$8 = 1'