linecounter2 is an alternate version that goes to the previous line, erases it and rewrites with new info. Might be useful if you need the newline character at the end of the string (for example to flush an output buffer).
Last active
November 17, 2021 09:17
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Output a running count of lines
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| #!/usr/bin/env bash | |
| # Output a running counter of lines passed to the script. | |
| # Optionally, if you know the total count you can give it as an argument. | |
| # | |
| # Example (bash): | |
| # for i in $(seq 50000); do echo "line content"; done | linecounter 50000 | |
| # | |
| # To preserve the original output, use tee: | |
| # for i in $(seq 50000); do echo "line content"; done | tee output.log | linecounter 50000 | |
| line_nr=0 | |
| while read -r line; do | |
| line_nr=$((line_nr + 1)) | |
| printf "\r%'d" $line_nr | |
| test -n "$1" && printf "/%'d" $1 | |
| done | |
| echo |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| #!/usr/bin/env bash | |
| # Output a running counter of lines passed to the script. | |
| # Optionally, if you know the total count you can give it as an argument. | |
| # | |
| # Example (bash): | |
| # for i in $(seq 50000); do echo "line content"; done | linecounter 50000 | |
| # | |
| # To preserve the original output, use tee: | |
| # for i in $(seq 50000); do echo "line content"; done | tee output.log | linecounter 50000 | |
| line_nr=0 | |
| echo | |
| while read -r line; do | |
| line_nr=$((line_nr + 1)) | |
| tput cuu1 # move cursor up 1 line | |
| tput el # erase line | |
| printf "%'d" $line_nr # output number formatted according to locale | |
| test -n "$1" && printf "/%'d" $1 # output total amount if given | |
| echo | |
| done |
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Demo:
linecounter_demo.mp4