Created
August 30, 2023 13:24
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Bash Input Output Testing
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| # test input/output availability, accurately but noisely | |
| (: </dev/stdin || printf '%s\n' 'cannot read stdin') || : | |
| (: >/dev/stdin || printf '%s\n' 'cannot write stdin') || : | |
| (: </dev/stdout || printf '%s\n' 'cannot read stdout') || : | |
| (: >/dev/stdout || printf '%s\n' 'cannot write stdout') || : | |
| (: </dev/stderr || printf '%s\n' 'cannot read stderr') || : | |
| (: >/dev/stderr || printf '%s\n' 'cannot write stderr') || : | |
| (: </dev/tty || printf '%s\n' 'cannot read tty') || : | |
| (: >/dev/tty || printf '%s\n' 'cannot write tty') || : | |
| # test input/output availability, silently with &>/dev/null, but this causes stdout and stderr to be closed for reading | |
| if ! (: </dev/stdin) &>/dev/null; then printf '%s\n' 'cannot silently read stdin'; fi | |
| if ! (: >/dev/stdin) &>/dev/null; then printf '%s\n' 'cannot silently write stdin'; fi | |
| if ! (: </dev/stdout) &>/dev/null; then printf '%s\n' 'cannot silently read stdout'; fi | |
| if ! (: >/dev/stdout) &>/dev/null; then printf '%s\n' 'cannot silently write stdout'; fi | |
| if ! (: </dev/stderr) &>/dev/null; then printf '%s\n' 'cannot silently read stderr'; fi | |
| if ! (: >/dev/stderr) &>/dev/null; then printf '%s\n' 'cannot silently write stderr'; fi | |
| if ! (: </dev/tty) &>/dev/null; then printf '%s\n' 'cannot silently read tty'; fi | |
| if ! (: >/dev/tty) &>/dev/null; then printf '%s\n' 'cannot silently write tty'; fi | |
| # see is-tty --test for a full fledged test |
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