0x06b-每个开发人员都应该知道的 10 个基本终端命令

➜ grep -i "REact" compiler/apps/playground/app/index.tsx
? '[DEV] React Compiler Playground'
: 'React Compiler Playground'

➜ grep -i "REact" compiler/apps/playground/app/index.tsx
? '[DEV] React Compiler Playground'
: 'React Compiler Playground'

➜ grep -c "React" compiler/apps/playground/app/index.tsx

➜ grep -c "React" compiler/apps/playground/app/index.tsx

➜ grep -i "Operation not supported on socket" system.log
09/24 08:51:01 INFO :..settcpimage: Get TCP images rc - EDC8112I Operation not supported on socket.

➜ grep -i "Operation not supported on socket" system.log
09/24 08:51:01 INFO :..settcpimage: Get TCP images rc - EDC8112I Operation not supported on socket.

➜ grep -e "error" -e "404" system.log

npm error code E404

npm error 404 'trevorlasn.com@*' is not in this registry.

npm error A complete log of this run can be found in: /Users/trevorindreklasn/.npm/_logs/2024-08-20T16_41_32_846Z-debug-0.log

➜ grep -e "error" -e "404" system.log

npm error code E404

npm error 404 'trevorlasn.com@*' is not in this registry.

npm error A complete log of this run can be found in: /Users/trevorindreklasn/.npm/_logs/2024-08-20T16_41_32_846Z-debug-0.log

➜ grep -o -r "fs" node_modules | wc -l
22491

➜ grep -o -r "fs" node_modules | wc -l
22491

➜ man grep

NAME
     grep, egrep, fgrep, rgrep, bzgrep, bzegrep, bzfgrep, zgrep,
     zegrep, zfgrep – file pattern searcher

SYNOPSIS
     grep [-abcdDEFGHhIiJLlMmnOopqRSsUVvwXxZz] [-A num] [-B num]
          [-C num] [-e pattern] [-f file] [--binary-files=value]
          [--color[=when]] [--colour[=when]] [--context=num]
          [--label] [--line-buffered] [--null] [pattern] [file ...]

DESCRIPTION
     The grep utility searches any given input files, selecting
     lines that match one or more patterns.  By default, a pattern
     matches an input line if the regular expression (RE) in the
     pattern matches the input line without its trailing newline.
     An empty expression matches every line.  Each input line that
     matches at least one of the patterns is written to the standard
     output.

     grep is used for simple patterns and basic regular expressions
     (BREs); egrep can handle extended regular expressions (EREs).
     See re_format(7) for more information on regular expressions.
     fgrep is quicker than both grep and egrep, but can only handle
     fixed patterns (i.e., it does not interpret regular
     expressions).  Patterns may consist of one or more lines,
     allowing any of the pattern lines to match a portion of the
     input.

     zgrep, zegrep, and zfgrep act like grep, egrep, and fgrep,
     respectively, but accept input files compressed with the
     compress(1) or gzip(1) compression utilities.  bzgrep, bzegrep,
     and bzfgrep act like grep, egrep, and fgrep, respectively, but
     accept input files compressed with the bzip2(1) compression
     utility.

     The following options are available:

     -A num, --after-context=num
             Print num lines of trailing context after each match.
             See also the -B and -C options.
             ...

➜ man grep

NAME
     grep, egrep, fgrep, rgrep, bzgrep, bzegrep, bzfgrep, zgrep,
     zegrep, zfgrep – file pattern searcher

SYNOPSIS
     grep [-abcdDEFGHhIiJLlMmnOopqRSsUVvwXxZz] [-A num] [-B num]
          [-C num] [-e pattern] [-f file] [--binary-files=value]
          [--color[=when]] [--colour[=when]] [--context=num]
          [--label] [--line-buffered] [--null] [pattern] [file ...]

DESCRIPTION
     The grep utility searches any given input files, selecting
     lines that match one or more patterns.  By default, a pattern
     matches an input line if the regular expression (RE) in the
     pattern matches the input line without its trailing newline.
     An empty expression matches every line.  Each input line that
     matches at least one of the patterns is written to the standard
     output.

     grep is used for simple patterns and basic regular expressions
     (BREs); egrep can handle extended regular expressions (EREs).
     See re_format(7) for more information on regular expressions.
     fgrep is quicker than both grep and egrep, but can only handle
     fixed patterns (i.e., it does not interpret regular
     expressions).  Patterns may consist of one or more lines,
     allowing any of the pattern lines to match a portion of the
     input.

     zgrep, zegrep, and zfgrep act like grep, egrep, and fgrep,
     respectively, but accept input files compressed with the
     compress(1) or gzip(1) compression utilities.  bzgrep, bzegrep,
     and bzfgrep act like grep, egrep, and fgrep, respectively, but
     accept input files compressed with the bzip2(1) compression
     utility.

     The following options are available:

     -A num, --after-context=num
             Print num lines of trailing context after each match.
             See also the -B and -C options.
             ...

➜ cat file1.txt file2.txt > file3.txt

➜ cat file1.txt file2.txt > file3.txt

➜ cat employees.csv
ID,Name,Department
101,John Doe,Sales
102,Jane Smith,Engineering
103,Jim Brown,Sales

➜ cat employees.csv
ID,Name,Department
101,John Doe,Sales
102,Jane Smith,Engineering
103,Jim Brown,Sales

➜ awk -F',' '
    NR==FNR {salaries[$1]=$2; next}
    FNR==1 {next}
    {print $2, salaries[$1]}
' salaries.csv employees.csv
John Doe 50000
Jane Smith 60000
Jim Brown 55000

➜ awk -F',' '
    NR==FNR {salaries[$1]=$2; next}
    FNR==1 {next}
    {print $2, salaries[$1]}
' salaries.csv employees.csv
John Doe 50000
Jane Smith 60000
Jim Brown 55000

➜ awk -F',' '
    NR==FNR {salaries[$1]=$2; next}
    FNR==1 {next}
    {print $2, salaries[$1]}
' salaries.csv employees.csv > combined.csv

➜ cat combined.csv
John Doe 50000
Jane Smith 60000
Jim Brown 55000

➜ awk -F',' '
    NR==FNR {salaries[$1]=$2; next}
    FNR==1 {next}
    {print $2, salaries[$1]}
' salaries.csv employees.csv > combined.csv

➜ cat combined.csv
John Doe 50000
Jane Smith 60000
Jim Brown 55000